Academic literature on the topic 'Turbo C (Computer file)'
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Journal articles on the topic "Turbo C (Computer file)"
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Challab, DJ. "Turbo C++." Information and Software Technology 34, no. 9 (September 1992): 617–18. http://dx.doi.org/10.1016/0950-5849(92)90140-k.
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Ohyama, Nagaaki. "IS & C system and file protection mechanism." Computer Methods and Programs in Biomedicine 43, no. 1-2 (May 1994): 37–42. http://dx.doi.org/10.1016/0169-2607(94)90183-x.
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BAFTIU, Naim, and Samedin KRABAJ. "Creating Prototype Virus - Destroying Files and Texts on Any Computer." PRIZREN SOCIAL SCIENCE JOURNAL 3, no. 1 (April 26, 2019): 62. http://dx.doi.org/10.32936/pssj.v3i1.78.
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When we study how viruses work and prevent them, we've developed a very simple application where we can see a prototype of a virus and virus function, as well as neutralizing a file if we want to break it down its structure at the level of the bits Purpose-Understand how a virus works by programming it in a high programming language. In our case, the C # programming language with the Visual Studio program that uses the .Net Framework. With the Windows Form Application module, the same application we are creating can also use it to neutralize a sentence if we know it is infected by interfering with the file we set up itself and by disrupting the system his Binary.
Key words: Component, Virus, File, C# Programming, Visual Studio.
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Ferreira Lima, João Vicente, Issam Raïs, Laurent Lefèvre, and Thierry Gautier. "Performance and energy analysis of OpenMP runtime systems with dense linear algebra algorithms." International Journal of High Performance Computing Applications 33, no. 3 (August 9, 2018): 431–43. http://dx.doi.org/10.1177/1094342018792079.
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In this article, we analyze performance and energy consumption of five OpenMP runtime systems over a non-uniform memory access (NUMA) platform. We also selected three CPU-level optimizations or techniques to evaluate their impact on the runtime systems: processors features Turbo Boost and C-States, and CPU Dynamic Voltage and Frequency Scaling through Linux CPUFreq governors. We present an experimental study to characterize OpenMP runtime systems on the three main kernels in dense linear algebra algorithms (Cholesky, LU, and QR) in terms of performance and energy consumption. Our experimental results suggest that OpenMP runtime systems can be considered as a new energy leverage, and Turbo Boost, as well as C-States, impacted significantly performance and energy. CPUFreq governors had more impact with Turbo Boost disabled, since both optimizations reduced performance due to CPU thermal limits. An LU factorization with concurrent-write extension from libKOMP achieved up to 63% of performance gain and 29% of energy decrease over original PLASMA algorithm using GNU C compiler (GCC) libGOMP runtime.
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Petkov, V., and N. Bakaltchev. "FIT, a computer program for decomposition of powder diffraction patterns and profile analysis of pair correlation functions." Journal of Applied Crystallography 23, no. 2 (April 1, 1990): 138–40. http://dx.doi.org/10.1107/s002188988901410x.
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FIT is an interactive computer program for fitting analytical models to powder diffraction patterns and to pair correlation functions. FIT has been written in Turbo C and runs on IBM XT/AT or compatible personal computers.
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Ciric, Miroslav, and Svetozar Rancic. "Parsing in different languages." Facta universitatis - series: Electronics and Energetics 18, no. 2 (2005): 299–307. http://dx.doi.org/10.2298/fuee0502299c.
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A compiler is a translator that accepts as input formatted source file or files, and produces as output a file that may be run directly on a computer. Given the same ANSI C++ compliant input file, two different ANSI C++ compliant compilers running on the same operating system produce two different executable programs that should execute in exactly the same way. To some degree, this is achieved by the standardization of the C++ language, but it is also possible because computer programming languages like C++ can be compiled using reliable technologies with long traditions and understood characteristics. LALR(k), as practical version of LR, is such reliable technology for parsing. Traditional LALR(1) tool YACC has proved his value during years of successful applications. Nowadays there are a few commercial and noncommercial alternatives that are very interesting and promising. This paper will examine some of the them with ability of parsing in different programming languages.
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Yang, Xiaolong, Jianchao Zheng, Zesong Fei, and Bin Li. "Optimal File Dissemination and Beamforming for Cache-Enabled C-RANs." IEEE Access 6 (2018): 6390–99. http://dx.doi.org/10.1109/access.2017.2775198.
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Tripathy, S. "Review: Windows NT File System Internals: A Developer's Guide." Computer Bulletin 40, no. 5 (September 1, 1998): 31. http://dx.doi.org/10.1093/combul/40.5.31-c.
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Seitz, Kerry A., Theresa Foley, Serban D. Porumbescu, and John D. Owens. "Supporting Unified Shader Specialization by Co-opting C++ Features." Proceedings of the ACM on Computer Graphics and Interactive Techniques 5, no. 3 (July 25, 2022): 1–17. http://dx.doi.org/10.1145/3543866.
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Modern unified programming models (such as CUDA and SYCL) that combine host (CPU) code and GPU code into the same programming language, same file, and same lexical scope lack adequate support for GPU code specialization, which is a key optimization in real-time graphics. Furthermore, current methods used to implement specialization do not translate to a unified environment. In this paper, we create a unified shader programming environment in C++ that provides first-class support for specialization by co-opting C++'s attribute and virtual function features and reimplementing them with alternate semantics to express the services required. By co-opting existing features, we enable programmers to use familiar C++ programming techniques to write host and GPU code together, while still achieving efficient generated C++ and HLSL code via our source-to-source translator.
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Eladawi, A. E., E. S. Gadelmawla, I. M. Elewa, and A. A. Abdel-Shafy. "An application of computer vision for programming computer numerical control machines." Proceedings of the Institution of Mechanical Engineers, Part B: Journal of Engineering Manufacture 217, no. 9 (September 1, 2003): 1315–24. http://dx.doi.org/10.1243/095440503322420241.
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Generation of the part programs, or tool paths, for products to be manufactured by computer numerical control (CNC) machines is very important. Many methods have been used to produce part programs, ranging from manual calculations to computer aided design/ manufacturing (CAD/CAM) systems. This work introduces a new technique for generating the part programs of existing products using the latest technology of computer vision. The proposed vision system is applicable for two-dimensional vertical milling CNC machines and is calibrated to produce both metric and imperial dimensions. Two steps are used to generate the part program. In the first step, the vision system is used to capture an image for the product to be manufactured. In the second step, the image is processed and analysed by software specially written for this purpose. The software CNCVision is fully written (in lab) using Microsoft Visual C++ 6.0. It is ready to run on any Windows environment. The CNCVision software processes the captured images and applies computer vision techniques to extract the product dimensions, then generates a suitable part program. All required information for the part program is calculated automatically, such as G-codes, X and Y coordinates of start-points and end-points, radii of arcs and circles and direction of arcs (clockwise or counterclockwise). The generated part program can be displayed on screen, saved to a file or sent to MS Word or MS Excel. In addition, the engineering drawing of the product can be displayed on screen or sent to AutoCAD as a drawing file.
Dissertations / Theses on the topic "Turbo C (Computer file)"
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Clark, Miriam Shaheed. "Automation of the Modular Pattern System basic skirt pattern drafting methodology using Turbo Pascal and dBaseII." Thesis, Kansas State University, 1986. http://hdl.handle.net/2097/9908.
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Merritt, John W. "Distributed file systems in an authentication system." Thesis, Kansas State University, 1986. http://hdl.handle.net/2097/9938.
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Laos, Pontus, and Alexander Libot. "Comparing Conventional- and Modern Programming Languages for Developing a File System." Thesis, Malmö universitet, Institutionen för datavetenskap och medieteknik (DVMT), 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:mau:diva-43451.
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Most of the software stack is built upon C today. C is a very flexible language, but the flexibility also brings some safety risks, particularly when handling memory through pointers. Rust is a new programming language which can guarantee memory safety without performance-heavy runtime services such as garbage collection. In this article, two partial file systems are implemented based on the design of EXT2. One system is implemented in C — Nafs — and one system is implemented in Rust — Rufs. A number of benchmarks are also developed, with the purpose of testing the most common features of a file system. After running the benchmarks, the results showed that Nafs provided better performance for all but one feature. There could be many reasons for this, and some hypotheses are discussed. Aspects like different compiler optimizations, the use of pointer dereferencing vs. data structure representation, using dynamic memory, and using system calls are considered. Some optimizations to Rufs are also implemented, and their impact analyzed. Earlier research has shown that Rust can guarantee memory safety while still providing good performance. It has also shown that Rust can be used to implement system programs, such as operating system kernels. Over the course of this article, it is shown that safe Rust can be used to implement a file system — thereby guaranteeing a memory safe program. It is also shown that a file system implemented in safe Rust provides worse performance than a similar system written in C. Future work will have to tell whether a file system can be as performant in Rust as in C, by using different implementation methods or unsafe Rust for some of the most performance critical parts of the system.
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Yen, Wen-Tsung. "Comparison of SPICE and Network C simulation models using the CAM system." PDXScholar, 1991. https://pdxscholar.library.pdx.edu/open_access_etds/4243.
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The performance of SPICE and Network C (NC) circuit simulator when simulating MOS transistor circuits has been investigated and compared. SPICE analog model, NC analog model and NC MOS_PWL model are the three MOS transistor models being used. The comparison between SPICE and NC includes five areas. They are MOS transistor model, circuit analysis and computational methods, limitation on the ability to simulate circuits containing the MOS transistor diode configuration, run time and the ability to build new circuit component models using derived equations.
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Tollefson, Bradley A. "The J-shell command language interpreter." Virtual Press, 1985. http://liblink.bsu.edu/uhtbin/catkey/506686.
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A command language interpreter (CLI) translates commands entered by the user into system actions. The shell is a specific type of CLI that was originally designed and used with UNIX operating systems.The author proposes to design and implement a shell-like CLI on top of the VMS operating system. The shell will enhance VMS features by providing an easier to use syntax and by providing features that are not currently available through VMS. These features include piping facilities and the ability to enter and/or reference multiple commands from a single command line. A language reference manual is provided with the J-shell. This manual explains the features and commands of the J-shell.
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Sibanda, Phathisile. "Connection management applications for high-speed audio networking." Thesis, Rhodes University, 2008. http://hdl.handle.net/10962/d1006532.
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Traditionally, connection management applications (referred to as patchbays) for high-speed audio networking, are predominantly developed using third-generation languages such as C, C# and C++. Due to the rapid increase in distributed audio/video network usage in the world today, connection management applications that control signal routing over these networks have also evolved in complexity to accommodate more functionality. As the result, high-speed audio networking application developers require a tool that will enable them to develop complex connection management applications easily and within the shortest possible time. In addition, this tool should provide them with the reliability and flexibility required to develop applications controlling signal routing in networks carrying real-time data. High-speed audio networks are used for various purposes that include audio/video production and broadcasting. This investigation evaluates the possibility of using Adobe Flash Professional 8, using ActionScript 2.0, for developing connection management applications. Three patchbays, namely the Broadcast patchbay, the Project studio patchbay, and the Hospitality/Convention Centre patchbay were developed and tested for connection management in three sound installation networks, namely the Broadcast network, the Project studio network, and the Hospitality/Convention Centre network. Findings indicate that complex connection management applications can effectively be implemented using the Adobe Flash IDE and ActionScript 2.0.
Books on the topic "Turbo C (Computer file)"
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Write TSRs now with Borland's Turbo Assembler, Turbo C/C++, Turbo Pascal. Plano, Tex: Wordware Pub., 1993.
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Schildt, Herbert. Advanced Turbo C. Berkeley, Calif., U.S.A: Osborne McGraw-Hill, 1987.
Find full textBook chapters on the topic "Turbo C (Computer file)"
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Gonzalez, Avelino J. "Multi-file Programs." In Computer Programming in C for Beginners, 147–56. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-50750-3_10.
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Balta, Horia, Alexandru Isar, Dorina Isar, and Maria Balta. "Simulating the Operation of Turbo Codes through the Monte Carlo Method, Comparison between MATLAB, C and C#." In Frontiers in Computer Education, 1127–39. Berlin, Heidelberg: Springer Berlin Heidelberg, 2012. http://dx.doi.org/10.1007/978-3-642-27552-4_146.
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Weiskamp, Keith. "Introduction to I/O and File Handling." In Advanced Turbo C Programming, 207. Elsevier, 1988. http://dx.doi.org/10.1016/b978-0-12-742689-1.50011-9.
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Yu, Liguo. "Using Kolmogorov Complexity to Study the Coevolution of Header Files and Source Files of C-alike Programs." In Research Anthology on Recent Trends, Tools, and Implications of Computer Programming, 814–24. IGI Global, 2021. http://dx.doi.org/10.4018/978-1-7998-3016-0.ch036.
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In C-alike programs, the source code is separated into header files and source files. During the software evolution process, both these two kinds of files need to adapt to changing requirement and changing environment. This paper studies the coevolution of header files and source files of C-alike programs. Using normalized compression distance that is derived from Kolmogorov complexity, we measure the header file difference and source file difference between versions of an evolving software product. Header files distance and source files distance are compared to understand their difference in pace of evolution. Mantel tests are performed to investigate the correlation of header file evolution and source file evolution. The study is performed on the source code of Apache HTTP web server.
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Manzo, V. J. "Building Stand-alone Applications." In Max/MSP/Jitter for Music. Oxford University Press, 2011. http://dx.doi.org/10.1093/oso/9780199777679.003.0016.
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In this chapter, we will analyze a “Chord Namer” application that allows a user to enter a chord name and see the notes on a MIDI keyboard. Unlike the other patches we’ve worked on thus far, we will “build” this patch as a stand-alone program that can be used on any computer even if it does not have Max installed. Stand-alone programs are a great way of distributing your work to people for educational or commercial purposes. Open the file chord_namer.maxpat from the Chapter 11 Examples folder. This patch allows users to type in the name of a chord (C, for example) and see the chord displayed on a large kslider. Users can then play the chord on their MIDI keyboard while looking at the visual example. The letter name of each note appears on each chord tone when it is highlighted. For taller chords, a user may enable more chord tones to be added than simply just a root, third, and fifth. For example, a user wanting to play a Cdom7#9 chord could simply enable 7ths and 9ths to be displayed by checking the appropriate toggles, typing Cdom7#9 into the space provided, and pressing the return or enter key. 1. Type C into the text box at the top left and press the return or enter key 2. Play a C chord on your MIDI keyboard This patch could be useful for helping people perform a piece for which they have only a lead sheet with chord names. Let’s take a look inside the patch. The patch is currently in Presentation mode. Unlock the patch and put it into Patching mode. The patch is rather large in size so you may need to zoom out on the patch (⌘for Mac or ctrl for Windows ). Now that the patch is open, you may be surprised to see that there is only a small number of objects inside. Take note of the 3 bpatchers in the patch that generate chords, handle MIDI output, and, to the right, above the kslider, handle MIDI input.
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Manzo, V. J. "Informal Music Learning Instruments." In Max/MSP/Jitter for Music. Oxford University Press, 2011. http://dx.doi.org/10.1093/oso/9780199777679.003.0024.
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In 2010, I was involved in a research project called the Interactive Music Technology Curriculum Project (Manzo & Dammers, 2010), or IMTCP; its goal was to teach music composition and performance to students who have no musical training by using soft ware instruments that allow them to play chord functions. In this chapter, we will examine the patches developed for this project. As you will see, even though each patch facilitates a different musical activity, the patches themselves use similar chunks of code neatly organized in bpatchers. These patches allow students to play chords, at first, with the number keys (1–8) from a computer keyboard as they learn about diatonic scale degrees and chord functions. Students in this project were asked to go online and get the YouTube links to their 10 favorite songs. The faculty for this project took those songs and reduced each part of the form (verse, chorus, bridge, etc.) to a set of numerical chord functions within a key. For example, the verse would be referred to as a The project was influenced by the Manhattanville Music Curriculum Project (MMCP; Thomas, 1970) and Lucy Green’s research on Informal Music Learning (Green, 2008). “1 5 6 4” in C Major while the chorus was a “2 4 1 5.” Students would then use a patch to play back the chord functions using the ASCII keyboard. 1. Open the file E001.maxpat from within the folder E001 located in the Chapter 19 Examples folder 2. Press the number keys on your computer keyboard (1–8) to play back the C Major scale. Use the space bar to end the sustain 3. Click the toggles 3 and 5 to add a third and a fifth to the output. Notice that the name of the triad is now displayed on the right We’ve looked at patches similar to this in the EAMIR SDK. Let’s take a look at some of the more interesting and novel features of this patch.
Conference papers on the topic "Turbo C (Computer file)"
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Sekar, T. Chandra, Ramraj H. Sundararaj, Rajat Arora, and Abhijit Kushari. "Analysis of Failed Startup Sequence of a Single Spool Turbojet Engine." In ASME Turbo Expo 2020: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2020. http://dx.doi.org/10.1115/gt2020-14778.
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Abstract During the static testing of a single spool turbojet engine (400 N Titan Engine) running on Jet A-1 as fuel, the starting sequence was unsuccessful, however, upon substituting the fuel with Diesel the engine started successfully. Till that point, the engine operation/performance was normal, and a series of tests were conducted for a total time of 5 hours. These 5 hours of testing spanned over five months during which ambient temperature varied from 5 °C to 37 °C, and relative humidity varied from 40% to 90%. The starting sequence was unsuccessful at the maximum ambient temperature (37 °C) and moderate relative humidity condition (50%). During the test, various parameters including pressure, temperature, rotor speed and mass flow rate were measured and recorded using a computer based data acquisition. For the failed start-up case, during the starting sequence, a sudden decrease in rotor speed was observed as the rotor reached ∼80% of the calibration value followed by flameout in combustion chamber. This sudden drop in rotor speed occurred due to mild-surge in compressor which continued up to flameout. The cause of mild-surge is attributed to the momentary blockage at the exit of the compressor caused by the combustion process. These pressure fluctuations propagated downstream leading to flame out. The combination of high ambient temperature (35 °C) and moderate humidity (∼50%) resulted in higher combustion chamber temperature which resulted in the momentary blockage at compressor exit during the transient operation. The substitution of Diesel as fuel resulted in lower combustion chamber temperature, and resolved the issue. It is important to note that, the mild-surge observed in this case is caused by downstream condition, and would occur only at some special situations (inlet conditions). Hence, it may be concluded, that the compressor surge in a jet engine may be caused by downstream components (under some special conditions), and design modifications to these downstream components may resolve the issue in those cases.
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Rajagopalan, Ramesh, and R. M. H. Cheng. "Architecture of Operating System Software of an Autonomous Vehicle." In ASME 1991 International Computers in Engineering Conference and Exposition. American Society of Mechanical Engineers, 1991. http://dx.doi.org/10.1115/cie1991-0167.
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Abstract Operating system software of a prototype autonomous vehicle is presented in this paper. The prototype Autonomous Vehicle employs binary camera vision for navigation and is differentially steered. The software is a top-down design, modular in architecture to facilitate software maintenance and continual enhancement. At this present stage of development, it contains several parameter definition files and close to 50 major sub functions/sub function groups besides the main supervisory module. The subroutines range from system validation (data acquisition in real-time) and equipment calibration, image data filtering and processing to the driving and steering of the vehicle. The control codes are developed using the Borland Turbo-C compiler.
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Buchhorn, Nico, Sebastian Kukla, and Beate Bender. "Increased Load Carrying Capacity of Large Tilting-Pad Journal Bearings by Injection of Cold Oil." In ASME Turbo Expo 2016: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/gt2016-57475.
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In this paper a theoretical study with the aim to achieve higher load capacity of large tilting-pad turbine bearings is presented. The main focus is set on the reduction of thermal gradients inside the pad and thus, of adverse thermomechanical deformations. This allows for the increase of either the load carrying capacity, minimum film thickness hmin, and/or decrease maximum pad temperature Tmax. Subject of the investigation is a 5-pad tilting-pad bearing with rocker pivots. Each pad arc measures 56° and the pivot is positioned at 60 %. By having a 500mm inner diameter the 350mm long bearing features a relative clearance of 1.28% and nominal preload of 0.23. It is shown that the axial pad bending Δh (crowning) has a major impact on film thickness and pressure distributions and thus on the operational safety parameters. In order to reduce this effect, radial bores through the pad supplying pressurized cold oil (Tinj = 50 °C) are simulated. Despite the evident increase in oil film pressure, the primary purpose of the injection is to rinse away the layer of hot oil sticking to the pad surface. The maximum pad temperature and the overall pad temperature gradients are thereby decreased. The code used for simulation solves Reynolds and energy equations and computes thermomechanical deformations simultaneously. However, the simulations are carried out for one single pad only and are therefore supported by boundary conditions taken from experiments. In order to determine the impact of the approach on the static bearing characteristics, diameter and location of the bores are varied (0.3mm ≤ db ≤ 0.5mm). It is shown that pad crowing can be reduced significantly: The axial deviation of the film thickness Δh can be decreased from Δh = 47 μm to Δh = 31 μm, while the maximum temperature Tmax can be decreased by 20 K. Further, the minimum film thickness hmin can be increased by 16 μm. Subsequently, allowing the same limits for hmin and Tmax for the new design, the load capacity can be raised by up to 1.21MPa ≙ 44 %.
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Ravelli, S., and G. Barigozzi. "Comparison of RANS and DES Modeling Against Measurements of Leading Edge Film Cooling on a First-Stage Vane." In ASME Turbo Expo 2016: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/gt2016-57567.
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The performance of a showerhead arrangement of film cooling in the leading edge region of a first stage nozzle guide vane was experimentally and numerically evaluated. A six-vane linear cascade was tested at an isentropic exit Mach number of Ma2s = 0.42, with a high inlet turbulence intensity level of 9%. The showerhead cooling scheme consists of four staggered rows of cylindrical holes evenly distributed around the stagnation line, angled at 45° towards the tip. The blowing ratios tested are BR = 2.0, 3.0 and 4.0. Adiabatic film cooling effectiveness distributions on the vane surface around the leading edge region were measured by means of Thermochromic Liquid Crystals technique. Since the experimental contours of adiabatic effectiveness showed that there is no periodicity across the span, the CFD calculations were conducted by simulating the whole vane. Within the RANS framework, the very widely used Realizable k-ε (Rke) and the Shear Stress Transport k-ω (SST) turbulence models were chosen for simulating the effect of the BR on the surface distribution of adiabatic effectiveness. The turbulence model which provided the most accurate steady prediction, i.e. Rke, was selected for running Detached Eddy Simulation at the intermediate value of BR = 3. Fluctuations of the local temperature were computed by DES, due to the vortex structures within the shear layers between the main flow and the coolant jets. Moreover, mixing was enhanced both in the wall-normal and spanwise direction, compared to RANS modeling. DES roughly halved the prediction error of laterally averaged film cooling effectiveness on the suction side of the leading edge. However, neither DES nor RANS provided the expected decay of effectiveness progressing downstream along the pressure side, with 15% overestimation of ηav at s/C =0.2.
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McMurtry, Gary M., John C. Wiltshire, and Arnaud Bossuyt. "A Deep-Ocean Mass Spectrometer to Monitor Hydrocarbon Seeps and Pipelines." In ASME 2005 24th International Conference on Offshore Mechanics and Arctic Engineering. ASMEDC, 2005. http://dx.doi.org/10.1115/omae2005-67146.
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New developments in instrumentation for ocean environmental engineering are allowing unprecedented levels of trace contaminant measurement in the deep ocean. With funding from the U.S. National Science Foundation (NSF), our engineering design team constructed a new mass spectrometer-based in situ analysis system for work in the deep ocean environment over prolonged deployment periods. Our design goals were a depth capability of up to 4,000 m water depth (400 bars hydrostatic pressure) and autonomous operation for periods of up to six months to a year, depending upon the type of external battery system used or other deployment circumstances, e.g., availability of a power cable or fuel cell power source. We chose a membrane introduction mass spectrometry (MIMS) sampling approach, which allows for dissolved gases and volatile organics introduction into the mass spectrometer vacuum system. The MIMS approach and the hydrophobic, silicon-coated membrane chosen both draw upon our previous experience with this technology in the deep ocean. The membrane has been tested to 400 bars in a series of long-term hydrostatic pressure tests, which extend the 200-bar working depth rating of this membrane by a factor of 2. Long-term deployment capability of the moderately powered, approximately 100 W system, was accomplished by power management of the embedded computer system and custom electronics with Windows-based and custom software now fully-developed and bench tested. The entire system fits within a 6.5-inch outside diameter pressure housing that is approximately five feet long. It consists of a 1 to 200 amu range quadrupole mass spectrometer equipped with Faraday and electron multiplier detectors, compact turbo-molecular and backing diaphragm vacuum pumps, internal rechargeable batteries, and internal waste vacuum chamber. Sample routing past the MIMS is accomplished by computer-controlled solenoid valves. We designed the pressure housings of both 6AL4V and type 2 titanium alloys that are rated to working depths of >4,000 m and are essentially corrosion proof over long-term deployments. We designed and integrated a fail-safe valving system for both rapid response to high-pressure MIMS failure and a pressure-switch circuit and high-pressure solenoid valve to detect and protect against slow leaks of the MIMS. To route sample waters to the MIMS-based instrument, we also designed and built a rugged plastic plenum that couples to the face of the sampler head, the latter of which consists of the MIMS inlet and a full-ocean rated thermister temperature probe with an operational range from −5 to 50°C. These instrumentation innovations will be described in the paper.
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Mangani, Luca, David Roos Launchbury, Ernesto Casartelli, and Giulio Romanelli. "Development of High Order LES Solver for Heat Transfer Applications Based on the Open Source OpenFOAM Framework." In ASME Turbo Expo 2015: Turbine Technical Conference and Exposition. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/gt2015-43279.
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The computation of heat transfer phenomena in gas turbines plays a key role in the continuous quest to increase performance and life of both component and machine. In order to assess different cooling approaches computational fluid dynamics (CFD) is a fundamental tool. Until now the task has often been carried out with RANS simulations, mainly due to the relatively short computational time. The clear drawback of this approach is in terms of accuracy, especially in those situations where averaged turbulence-structures are not able to capture the flow physics, thus under or overestimating the local heat transfer. The present work shows the development of a new explicit high-order incompressible solver for time-dependent flows based on the open source C++ Toolbox OpenFOAM framework. As such, the solver is enabled to compute the spatially filtered Navier-Stokes equations applied in large eddy simulations for incompressible flows. An overview of the development methods is provided, presenting numerical and algorithmic details. The solver is verified using the method of manufactured solutions, and a series of numerical experiments is performed to show third-order accuracy in time and low temporal error levels. Typical cooling devices in turbomachinery applications are then investigated, such as the flow over a turbulator geometry involving heated walls and a film cooling application. The performance of various sub-grid-scale models are tested, such as static Smagorinsky, dynamic Lagrangian, dynamic one-equation turbulence models, dynamic Smagorinsky, WALE and sigma-model. Good results were obtained in all cases with variations among the individual models.
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Briones, Alejandro M., Brent A. Rankin, Scott D. Stouffer, Timothy J. Erdmann, and David L. Burrus. "Parallelized, Automated, Predictive, Imprint Cooling Model for Combustor Liners." In ASME Turbo Expo 2016: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/gt2016-56187.
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A novel parallelized, automated, predictive imprint cooling model (PAPRICO) was developed for modeling and simulation of combustor liners using a Reynolds averaged Navier-Stokes (RANS) approach. The methodology involves removing the film and effusion cooling jet geometry from the liner while retaining the cooling hole imprints on the liner. The PAPRICO can operate under two modalities, viz., two-sided and one-sided. For the two-sided PAPRICO model, the imprints are kept on the plenum and combustor sides of the liner. For the one-sided PAPRICO model, the imprints are retained only on the combustor side of the liner and there is no need for a plenum. Consequently, the one-sided PAPRICO significantly reduces the size of the mesh when compared with a mesh that resolves the film and effusion cooling holes. The PAPRICO model neither needs a priori knowledge of the cooling flow rates through various combustor liner regions nor specific mesh partitioning. The PAPRICO model uses the one-dimensional adiabatic, calorifically perfect, total energy equation. The total temperature, total pressure, jet angle, jet orientation, and discharge coefficient are needed to determine the imprint mass flow rate, momentum, enthalpy, turbulent kinetic energy, and eddy dissipation rate. These physical quantities are included in the governing equations as volumetric source terms in cells adjacent to the liner on the combustor side. Additionally, the two-sided PAPRICO model integrates the volumetric sources to calculate their corresponding volumetric sinks in the cells adjacent to the liner on the plenum side. The PAPRICO model user-defined subroutines were written in C programming language and linked to the ANSYS Fluent. A Fluent graphical user interface panel was also developed in Scheme language to effectively and conveniently form effusion cooling regions based on jet angle, jet orientation, pattern, and discharge coefficient. The PAPRICO algorithm automatically identifies and computes the jet area, jet diameter, jet centroid, and jet count per cooling region from an arbitrarily partitioned mesh. Jets with concentric patterns, containing multiple jet orientations, can be conveniently grouped into a single imprint zone. A referee combustor liner was simulated using PAPRICO under non-reacting flow conditions. The PAPRICO results were compared with the non-reacting flow results of a resolved geometry containing 1504 cooling jets (with multiple jet sizes, orientations and angles) and 7 dilution jets. The PAPRICO results were also compared with the non-reacting numerical results of the referee combustor liner with prescribed mass and enthalpy source terms. The numerical results were also compared with experimental measurements of mass flow rates through the referee combustor liner. The numerical results clearly conclude that PAPRICO can qualitatively and quantitatively emulate the local turbulent flow field with only one third of the mesh of that which resolves the effusion cooling jets. The simulations with prescribed mass and enthalpy sources fail to emulate the local turbulent flow field. The PAPRICO model can predict the relative flow rates through the various regions in the liner based on comparisons with measurements.
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El-Jummah, Abubakar M., Ahmad Nazari, Gordon E. Andrews, and John E. J. Staggs. "Impingement/Effusion Cooling Wall Heat Transfer: Reduced Number of Impingement Jet Holes Relative to the Effusion Holes." In ASME Turbo Expo 2017: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/gt2017-63494.
Full textAbstract:
Internal wall heat transfer for impingement/effusion cooling was measured and predicted using conjugate heat transfer (CHT) computational fluid dynamics (CFD). The work was only concerned with the internal wall heat transfer and not with the effusion film cooling and there was no hot gas crossflow. Previous work had predicted impingement/effusion internal wall cooling with equal number of holes. The present work investigated a small number of impingement holes and a larger number of effusion holes. The aim was to see if the effusion holes acted as a suction surface to the impingement surface flow and thus enhanced the wall heat transfer. Hole ratios of 1/4, 1/9 and 1/25 were studied by varying the number of effusion holes for a fixed array of impingement holes and a fixed impingement gap, Z, of 8 mm. The Z/D for the impingement holes was 2.7. The impingement hole pitch, X, to diameter, D ratio X/D was 10.6 at a constant effusion hole X/D of 4.7 for all the configurations. The impingement holes were aligned on the midpoint of four effusion holes. The results were computed for a mass flux G from 0.1–0.94 kg/sm2bar for all n. This gave 26 separate CFD/CHT computations. Locally surface, X2, average heat transfer coefficient (HTC), hx, values were determined using the lumped capacitance method. Nimonic 75 metal walls with imbedded thermocouples were used to determine hx from the time constant in a transient cooling experiment following electrical heating to about 80°C. The CHT/CFD predictions showed good agreement with measured data and the highest number of effusion holes for the 1/25 hole ratio gave the highest h. However, comparison with the predicted and experimental results for equal number of impingement and effusion holes for the same Z, showed that there was little advantage of decreasing the number of impingement holes, apart from that of decreasing the Z/D significantly for the 1/15 hole ratio, which increased the heat transfer. The largest number of effusion holes had the highest heat transfer due to the greater internal surface area of the holes and their closer spacing. This was present irrespective of the number of impingement holes and there was no evidence of any benefit of the 25 effusion holes enhancing the single impingement jet heat transfer. For the lowest number of effusion hole there was predicted to be a small disadvantage of reducing the number of impingement jets.
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Kumar, Rajeev, and Onkar Singh. "Computer Simulation and Optimization of Heat Recovery Steam Generator (HRSG)." In ASME Turbo Expo 2003, collocated with the 2003 International Joint Power Generation Conference. ASMEDC, 2003. http://dx.doi.org/10.1115/gt2003-38095.
Full textAbstract:
Heat recovery steam generators are successfully used in combined cycle power plants and many more applications. In a gas / steam combined cycle power plant the performance of bottoming cycle depends largely upon the effectiveness of HRSG. For a good HRSG in combined cycle power plants the heat exchange effectiveness should be as high as possible for maximum waste heat utilization and loss in the pressure of hot gases passing through HRSG should be small. In this paper, the computer simulation of HRSG has been carried out based on its thermodynamic study. An exhaustive generic computer code has been developed in C++ language for getting the critical information such as surface area required, number of tubes required, pressure loss, steam generation rate, effectiveness etc. for a single pressure & multi pressure HRSG. Results obtained using the code have been analyzed for varying operating thermodynamic conditions and different arrangements in HRSG. Preferable HRSG configuration and its thermodynamic analysis have been made using the computer code. Optimization of the HRSG design is carried out in respect to cost of HRSG using genetic algorithm.
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Nageswara Reddy, Pereddy. "Performance Enhancement of Gas Turbine Engines Topped With Wave Rotors and Pulse Detonation Combustors." In ASME Turbo Expo 2020: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2020. http://dx.doi.org/10.1115/gt2020-14911.
Full textAbstract:
Abstract In the present research work, a novel method of integrating the conventional gas turbine engine with a Wave Rotor (WR) and a Pulse Detonation Combustor (PDC) is proposed to increase the specific work and thermal efficiency of the engine. Two gas turbine engine configurations, viz. (i) Baseline engine topped with a wave rotor and a steady flow combustor (BWRSFC), and (ii) Baseline engine topped with a wave rotor and a pulse detonation combustor (BWRPDC), have been analyzed with and without recuperative systems. In the case of BWRPDC, the principle of quasi-steady expansion of detonation products through a nozzle into the ejector to entrain and eject the bypassed compressed air along with detonation products exhausted from WR, and a steady expansion of remained detonation products of PDC through the WR to provide the required energy transfer to further compress and supply the un-bypassed compressed air to PDC, has been considered. The pressure of the ejected gases from the ejector will be 25% to 35% higher than the air pressure delivered by the compressor of baseline engine and can develop more specific work with enhanced thermal efficiency when expanded in the turbine. A computer code is developed in MATLAB to simulate the engine performance with and without recuperation / regeneration. For thermodynamic calculations, two un-recuperated micro-turbine engines called C-30 and C-60 made by Capstone Turbine Corporation are considered. C2H4/air is taken as the fuel-oxidizer. The variation in specific work, and thermal efficiency with wave rotor pressure ratio has been investigated for C-30 and C-60 engines. Further, a sensitivity analysis of the performance of BWRPDC with a change in the Entrainment Coefficient (EC) of ejector has also been made.