Relevant bibliographies by topics / Tangential distortion

Contents

  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers

Academic literature on the topic 'Tangential distortion'

Author: Grafiati
Published: 4 June 2021
Last updated: 1 February 2022

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Journal articles on the topic "Tangential distortion"

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Peng, Fu Qiang, Qiang Chen, and Jun Wei Bao. "Distortion Correction for the Gun Barrel Bore Panoramic Image." Applied Mechanics and Materials 427-429 (September 2013): 680–85. http://dx.doi.org/10.4028/www.scientific.net/amm.427-429.680.

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Single Reflector Panoramic Imaging System (SRPIS) has been widely used because of its advantages such as simple structure, fast imaging, integration and miniaturization. It can observe objects around the reflector mirror, which fits for the quality inspection of gun barrel bore. However, its images often suffer from serious distortions in radial and tangential directions. Therefore, to ensure the accuracy of captured images, distortion must be eliminated. In this paper, a distortion correction method is proposed based on the imaging characteristics of SRPIS. Firstly the relationship between the height of a certain point on the gun barrel bore and the radius of image point is derived. Then the correction model is built based on the relationship. Aiming at the captured annular image, a new chessboard corner detection algorithm is proposed. The correction parameters are obtained by using the algorithm according to the labeled image. The real experiment results demonstrate that the correction effects of radial and tangential distortions are satisfactory. The error is controlled at sub-pixel level.
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Apriani, Atika, Rochan Rifai, Frida Agung Rakhmadi, and Khamidinal. "USB 2.0 Digital Camera Characterization for Optimizing the Making of High Power RGB-LED Fluorescence Imaging System." Proceeding International Conference on Science and Engineering 3 (April 30, 2020): 255–57. http://dx.doi.org/10.14421/icse.v3.508.

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This research aims to obtain the focal length and radial and tangential distortion of a USB 2.0 digital camera. This research was conducted in three stages namely preparation of tools and materials, camera characterization, and data processing. The tools used in this study include a USB 2.0 digital camera and MATLAB R2013a software, while the object is a collimator board. Characterization of digital cameras is done through data collection with a distance variation of 3 cm until 15 cm, then the data obtained is processed using MATLAB R2013a software to obtain the focal length and radial distortion and tangential distortion values. The USB camera that used has the characteristic focal length and radial distortion and certain tangential distortion for each distance.
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Ekpar, Frank, Masaaki Yoneda, and Hiroyuki Hase. "Correcting Distortions in Panoramic Images Using Constructive Neural Networks." International Journal of Neural Systems 13, no. 04 (August 2003): 239–50. http://dx.doi.org/10.1142/s0129065703001601.

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This paper presents a novel approach to the correction of panoramic (wide-angle) image distortions. Unlike traditional methods that separate the distortion of the panoramic image into radial and tangential components and then concentrate on the correction of one type of distortion at a time, the method presented in this paper uses an integrated approach that simultaneously corrects all non-linear distortions of the panoramic image. The system uses data obtained from carefully constructed calibration patterns to automatically build and train a constructive neural network of suitable complexity to approximate the characteristic distortion of the panoramic image. The trained neural network is then used to correct the distortions represented by the sample data. It is demonstrated that by applying the distortion correction method presented in this paper to panoramic images representing real world scenes, perspective-corrected views of the real world scene that are usable in a wide variety of applications can be generated.
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Liu, Yue, Dewen Cheng, Qiwei Wang, Qichao Hou, Luo Gu, Hailong Chen, Tong Yang, and YongTian Wang. "Optical distortion correction considering radial and tangential distortion rates defined by optical design." Results in Optics 3 (May 2021): 100072. http://dx.doi.org/10.1016/j.rio.2021.100072.

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Walker, Amy, Peter Metcalfe, Gary Liney, Vikneswary Batumalai, Kylie Dundas, Carri Glide-Hurst, Geoff P. Delaney, et al. "MRI geometric distortion: Impact on tangential whole-breast IMRT." Journal of Applied Clinical Medical Physics 17, no. 5 (September 2016): 7–19. http://dx.doi.org/10.1120/jacmp.v17i5.6242.

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Li, Yu Long, Peng Sun, and Ming Li Dong. "A Spatial Optimization for Camera Interior Orientation Parameters." Applied Mechanics and Materials 389 (August 2013): 941–47. http://dx.doi.org/10.4028/www.scientific.net/amm.389.941.

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A new calibration method for camera interior orientation parameters is proposed using the known spatial coordinates and the corresponding single photo. Firstly, principle point coordinates, principle distance and exterior orientation parameters are solved by the direct linear method without consideration of distortion parameters. Then, accurate interior and exterior orientation parameters are refined through the process of nonlinear optimization, during which the distance of spatial point to corresponding ray are minimized. Distortion factors of radial distortion, tangential distortion, affine distortion and non-orthogonal distortion are taken into consideration. This paper uses Levenberg-Marquardt optimization method to avoid inaccurate initial parameters influence upon the process of convergence.
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Peng, Hong Xing, Xiang Jun Zou, Jun Tao Xiong, Ding Zhong Wu, Jia Hui Shen, and Ze Xuan She. "Picking Robot Camera Calibration System Based on OpenCV." Advanced Materials Research 430-432 (January 2012): 1963–66. http://dx.doi.org/10.4028/www.scientific.net/amr.430-432.1963.

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Aim at the effect of the radial distortion and tangential distortion, the camera calibration principle, geometric model and complex equation solution were studied, in order to reduce the artificial participation in proofreading and error correction, then the camera’s software precise calibration module based on OpenCV was developed. The results showed that the system was quickly speed, high precision and could satisfy the requirements of robot vision navigation system and built the foundation for the next step research.
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Wu, Li Ming, Qi Li, and Si Cheng Chen. "Research of Multi-Touch Projection Camera Interaction Techniques Based on SOPC." Applied Mechanics and Materials 543-547 (March 2014): 784–87. http://dx.doi.org/10.4028/www.scientific.net/amm.543-547.784.

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Projection-camera interaction is a human-computer interaction technology which uses projector-camera as input-output devices, and combined with human movement as interactive mode. Introducting radial distortion and tangential distortion of lens to projection-geometric calibrate the camera system, the platform is used the Xilinx main processor Virtex-4 FX experimental box to building a projection-camera interactive implementation platform, and used the Baum-Welch algorithm which based on hidden Markov model for training gesture.
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Tian, Shan, Yu Li Liu, Gang Yao Zhao, and He Yang. "Experimental Research on Strain Distribution Characteristics of Thin-Walled Rectangular Tube in Rotary-Draw Bending." Advanced Materials Research 139-141 (October 2010): 502–5. http://dx.doi.org/10.4028/www.scientific.net/amr.139-141.502.

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The rotary-draw bending process of thin-walled rectangular tube is a complex process with large deformation, large displacement and finite strain which makes the defects, such as wrinkling, distortion and crack be easily produced. To study the complex plastic deformation characteristics of thin-walled rectangular 3A21 aluminum tube during rotary-draw bending, the distributions of tangential, circumferential and normal strain have been studied by experiment using grid method. The results show that the maximum value of three-direction strain appears in the ridges of rectangular tube and tangential strain is the maximum principal strain. The value of maximum tangential tensile strain is lager than the maximum tangential compressive strain; it is the reason why crake is prone to occur during rotary-draw bending. The strain distribution curve along bending direction is not completely symmetrical with middle cross-section. With the increase of bending angle, three-direction strain of tube also increases and circumferential strain increases relatively smaller.
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Hakkarainen, J. "DETERMINATION OF RADIAL AND TANGENTIAL DISTORTION OF AERIAL CAMERAS WITH A HORIZONTAL GONIOMETER." Photogrammetric Record 8, no. 44 (August 26, 2006): 180–87. http://dx.doi.org/10.1111/j.1477-9730.1974.tb00039.x.

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Dissertations / Theses on the topic "Tangential distortion"

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Dostál, Radek. "Pozice objektu ze soustavy kamer." Master's thesis, Vysoké učení technické v Brně. Fakulta informačních technologií, 2011. http://www.nusl.cz/ntk/nusl-412856.

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This thesis deals with reconstruction of golf ball position using multiple cameras. Reconstruction will be used for golf simulator project. System is using fotogrametric calibration and triangulation algorithm for obtaing point coordinates. Work also discuss options for camera selection. The result is making of prototype of the simulator.
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Books on the topic "Tangential distortion"

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Escudier, Marcel. Basic equations of viscous-fluid flow. Oxford University Press, 2018. http://dx.doi.org/10.1093/oso/9780198719878.003.0015.

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In this chapter it is shown that application of the momentum-conservation equation (Newton’s second law of motion) to an infinitesimal cube of fluid leads to Cauchy’s partial differential equations, which govern the flow of any fluid satisfying the continuum hypothesis. Any fluid flow must also satisfy the continuity equation, another partial differential equation, which is derived from the mass-conservation equation. It is shown that distortion of a flowing fluid can be split into elongational distortion and angular distortion or shear strain. For a Newtonian fluid, the normal and shear stresses in Cauchy’s equations are related to the elongational and shear-strain rates through Stokes’ constitutive equations. Substitution of these constitutive equations into Cauchy’s equations leads to the Navier-Stokes equations, which govern steady or unsteady flow of a fluid. A minor modification of the constitutive equations for a Newtonian fluid allows consideration of generalised Newtonian fluids, for which the viscosity depends upon the shear-strain rates. The boundary conditions for the tangential and normal velocity components are discussed briefly.
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Book chapters on the topic "Tangential distortion"

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Beauchemin, Seven S., and Ruzena Bajcsy. "Modelling and Removing Radial and Tangential Distortions in Spherical Lenses." In Multi-Image Analysis, 1–21. Berlin, Heidelberg: Springer Berlin Heidelberg, 2001. http://dx.doi.org/10.1007/3-540-45134-x_1.

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Giles, Paul. "Anamorphosis." In Backgazing: Reverse Time in Modernist Culture, 69–108. Oxford University Press, 2019. http://dx.doi.org/10.1093/oso/9780198830443.003.0002.

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This chapter considers how the work of various modernists associated with Bloomsbury during the interwar years—E. M. Forster, Virginia Woolf, Nancy Cunard—engaged with antipodal dimensions that effectively disturbed normative spatiotemporal representation within their narratives. In this way, the heterodox versions of temporality projected more overtly by Australasian writers also associated with Bloomsbury, if more tangentially—Katherine Mansfield, Henry Handel Richardson—appear to be reciprocally mirrored within the Western canon, as if in an anamorphic image. Anamorphosis is a projection giving a distorted image of the subject when seen from a conventional viewpoint but produced in such a way that, if viewed from a particular angle, the distortion will disappear and the image come to appear normal. The term was applied to his own art by Salvador Dalí, but it might be argued that antipodean modernism bears an uncanny, anamorphic relation to Western modernism more generally.
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Conference papers on the topic "Tangential distortion"

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Juarez-Salazar, Rigoberto, and Victor Hugo Diaz-Ramirez. "Distorted pinhole camera model for tangential distortion." In Optics and Photonics for Information Processing XV, edited by Khan M. Iftekharuddin, Abdul A. S. Awwal, and Victor Hugo Diaz-Ramirez. SPIE, 2021. http://dx.doi.org/10.1117/12.2594860.

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Spakovszky, Z. S. "Analysis of Aerodynamically Induced Whirling Forces in Axial Flow Compressors." In ASME Turbo Expo 2000: Power for Land, Sea, and Air. American Society of Mechanical Engineers, 2000. http://dx.doi.org/10.1115/2000-gt-0418.

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A new analytical model to predict the aerodynamic forces in axial flow compressors due to asymmetric tip-clearance is introduced. The model captures the effects of tip-clearance induced distortion (i.e. forced shaft whirl), unsteady momentum-induced tangential blade forces and pressure induced forces on the spool. Pressure forces are shown to lag the tip-clearance asymmetry, resulting in a tangential (i.e. whirl-inducing) force due to spool pressure. This force can be of comparable magnitude to the classical Alford force. Prediction and elucidation of the Alford force is also presented. In particular, a new parameter denoted as the blade loading indicator is deduced. This parameter depends only on stage geometry and mean flow and determines the direction of whirl tendency due to tangential blade loading forces in both compressors and turbines. All findings are suitable for incorporation into an overall dynamic system analysis and integration into existing engine design tools.
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Pazzi, Simone, and Vittorio Michelassi. "Analysis and Design Outlines of Centrifugal Compressor Inlet Volutes." In ASME Turbo Expo 2000: Power for Land, Sea, and Air. American Society of Mechanical Engineers, 2000. http://dx.doi.org/10.1115/2000-gt-0464.

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The flow inside centrifugal compressor inlet volutes is studied by means of numerical and experimental approaches. The performance of a typical test geometry is briefly compared with experiments and the relative performance of the various proposed modifications is discussed in terms of flow distortion and loss coefficient. The flow is analyzed at the exit of the volute. The effects of modifications to the standard axi-symmetric geometry are evaluated. The study includes the effect of flow splitters, the number of which is found to considerably alter the flow field. The analysis also includes changes in the geometry aimed at a better redistribution of the mass in the tangential direction.
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Kummari, Seetha Ramudu, Phillip E. Prueter, Michael F. P. Bifano, Antonio J. Seijas, and Benjamin F. Hantz. "Further Investigation Into the Damage Tolerance of Different Coke Drum Support Skirt Designs." In ASME 2019 Pressure Vessels & Piping Conference. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/pvp2019-93529.

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Abstract Evaluating the behavior of coke drums is challenging due to the randomness and uncertainties in typical cyclic loading conditions. Severe fluctuations in temperature and stress during the quench portion of the thermal cycle can often lead to distortion, fatigue damage, and ultimately, cracking. Since the evolution of damage in the coke drums is a cycle-dependent process, a snapshot of strain or distortion data generally has limited value in quantifying remaining life. Advanced fatigue methods and damage models are usually required to address the permanent irreversible damage and material degradation that is produced throughout multiple cycles. This paper represents an advanced finite element analysis (FEA)-based study that is a continuation of the work published in PVP2017-65807[1], with new coke drum support skirt geometries included in the comparisons. The thermal-mechanical behavior of five different support skirt designs; Egg-in-Cup, Tangential, Forged, Sliding, and Welded, are investigated, and relative fatigue life predictions are discussed for each type of design using consistent, idealized thermal transients.
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Barigozzi, G., S. Ravelli, H. Abdeh, A. Perdichizzi, M. Henze, and J. Krueckels. "Heat Transfer Analysis Over a Film Cooled Platform of a Vane Cascade With a Non-Uniform Inlet Flow." In ASME Turbo Expo 2017: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/gt2017-64266.

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This paper reports on heat transfer measurements performed on the film cooled platform of a linear nozzle vane cascade, subject to non-uniform inlet flow conditions. An obstruction, installed upstream of the cascade at different tangential positions, was responsible for inlet flow distortion. The platform cooling system included both purge flow from a slot located upstream of the leading edge and coolant ejection from a row of cylindrical holes located upstream of the slot. Testing was performed at inlet Mach number of Ma1 = 0.12 with both slot and combustor holes blowing at nominal conditions. Measured values of adiabatic film cooling effectiveness on the platform were used to obtain a detailed map of the convective heat transfer coefficient. The final goal was to compute the net heat flux reduction (NHFR), due to film cooling, when varying the relative position between obstruction and airfoil. Aligning the inflow non uniformity with the vane leading edge leads to a detrimental increase in the heat flux into the platform, within the vane passage. Conversely, positive NHFR values are observed over most of the platform surface if the inlet flow distortion is moved toward the suction side of the adjacent vane.
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Mandal, Pritesh, Justin Holder, Mark G. Turner, and Mark L. Celestina. "Design and Optimization of a Boundary Layer Ingesting Propulsor." In ASME Turbo Expo 2020: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2020. http://dx.doi.org/10.1115/gt2020-15603.

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Abstract The boundary layer ingestion concept has the potential to improve propulsion efficiency that will lead to better fuel economy of commercial aircraft. This design concept has been explored by NASA as the Single-aisle Turboelectric Aircraft with Aft Boundary-Layer propulsor “STARC-ABL.” This paper discusses the 1D-3D aerodynamic design and optimization process as well as the structural analysis of the rotor of a propulsor with incoming distortion. The propulsor is at the tail of the fuselage, and consists of an Inlet Guide Vane (IGV), Rotor, and Outlet Guide Vane (OGV). The design process presented accounts for only the large radial distortion and not the circumferential distortion. The paper also describes a pragmatic way of choosing orthogonal design parameters to proceed with the optimization process using a genetic algorithm. The final optimized design is highly dependent on the objective function to be optimized. A Modified Adiabatic Efficiency (MAE) has been defined to account for the loss of kinetic energy downstream of the propulsor CFD exit plane. This lost kinetic energy is essentially an approximation of the mixing loss of the tangential, axial and radial components of velocity at the OGV exit. The three blade-row adiabatic efficiency and MAE for an intermediate design case was 88.91% and 86.10% respectively. Upon further optimization and a different incoming distortion, using MAE as the objective function improved the MAE by 2.14% and adiabatic efficiency by 0.25% for the final design case presented in this paper. The rotor-only adiabatic efficiency for this case is 94.49%, the IGV-Rotor two blade-row efficiency is 92.71% and the Rotor-OGV two blade-row efficiency is 90.94%. The IGV is necessary to support the nacelle in this configuration. It also allows for the rotor work distribution to be optimized. The resulting rotor blade satisfies the static structural limit of a 1.1 safety factor for titanium at 110% speed. It also includes the pressure loads from the design point. The process uses an open source parametric blade generator whose source and input files for this geometry are on GitHub.
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Ji, L. C., J. Z. Xu, and J. Chen. "Study of Hot Streak Effects in a Counter-Rotating Turbine." In ASME Turbo Expo 2001: Power for Land, Sea, and Air. American Society of Mechanical Engineers, 2001. http://dx.doi.org/10.1115/2001-gt-0173.

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Based on its convection nature, some influences of the hot streak on a 1+1 (with inter-blade vane) counter-rotating turbine are studied by using a three-dimensional (3D) unsteady Euler solver. Emphasis is laid on the hot streak effect to the blade heat load and the clocking effects between hot streak and blade rows. One temperature distortion magnitude, two spanwise and four tangential positions, four clocking locations between vanes of first and second stage are examined. Results show that the effect of the hot streak on a counter-rotating turbine is nearly the same as a conventional turbine. However, clocking between the hot streak and the vane of the high pressure turbine (HPT) exerts significant influences on the heat load of the whole HPT stage. Also, clocking between the HPT vane and the vane of the low pressure turbine (LPT) affects the heat load of the LPT greatly. These effects cannot be captured with the steady flow assumption. So time accurate simulation about the hot streak/blade interaction must be used as a basis for the turbine design and optimization.
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Filipenco, Victor G., Sabri Deniz, J. Mark Johnston, Edward M. Greitzer, and Nicholas A. Cumpsty. "Effects of Inlet Flow Field Conditions on the Performance of Centrifugal Compressor Diffusers: Part 1 — Discrete-Passage Diffuser." In ASME 1998 International Gas Turbine and Aeroengine Congress and Exhibition. American Society of Mechanical Engineers, 1998. http://dx.doi.org/10.1115/98-gt-473.

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This is Part 1 of a two-part paper considering the performance of radial diffusers for use in a high performance centrifugal compressor. Part 1 reports on discrete-passage diffusers (shown in Fig. 1) while Part 2 describes a test of a straight-channel diffuser designed for equivalent duty. Two builds of discrete-passage diffuser were tested, with 30 and 38 separate passages. Both the 30 and 38 passage diffusers investigated showed comparable range of unstalled operation and similar level of overall diffuser pressure recovery. The paper concentrates on the influence of inlet flow conditions on the pressure recovery and operating range of radial diffusers for centrifugal compressor stages. The flow conditions examined include diffuser inlet Mach number, flow angle, blockage, and axial flow non-uniformity. The investigation was carried out in a specially built test facility, designed to provide a controlled inlet flow field to the test diffusers. The facility can provide a wide range of diffuser inlet velocity profile distortion and skew with Mach numbers up to unity and flow angles of 63° to 75° from the radial direction. The consequences of different averaging methods for the inlet total pressure distributions, which are needed in the definition of diffuser pressure recovery coefficient for non-uniform diffuser inlet conditions were also assessed. The overall diffuser pressure recovery coefficient, based on suitably averaged inlet total pressure, was found to correlate well with the momentum-averaged flow angle into the diffuser. Furthermore the pressure recovery coefficient was found to be essentially independent of the axial distortion at diffuser inlet, and the Mach number, over the wide flow range (from maximum flow to the beginning of flow instabilities) investigated. It is thus shown that the generally accepted sensitivity of diffuser pressure recovery performance to inlet flow distortion and boundary layer blockage can be largely attributed to inappropriate quantification of the average dynamic pressure at diffuser inlet. Use of an inlet dynamic pressure based on availability or mass-averaging in combination with definition of inlet flow angle based on mass average of the radial and tangential velocity at diffuser inlet removes this sensitivity.
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Mounts, Jon S., and Joost J. Brasz. "Analysis of Jet/Wake Mixing in a Vaneless Diffuser." In ASME 1992 International Gas Turbine and Aeroengine Congress and Exposition. American Society of Mechanical Engineers, 1992. http://dx.doi.org/10.1115/92-gt-418.

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A time-dependent, three-dimensional Navier-Stokes algorithm has been developed to study the unsteady flowfield interaction in the impeller and vaneless diffuser of a centrifugal compressor. This study describes the flow phenomena taking place in the entry region of a vaneless diffuser receiving the distorted impeller discharge flow. In the diffuser entry region, the initial dynamic variations in the velocity and flow angle (caused by the so-called jet/wake flow profile of the fluid leaving the impeller passages) mix out quickly. It was also found that the steady-state distortion in the hub-to-shroud plane, with higher through-flow velocities at the hub than at the shroud, persisted over a large area of the diffuser. Fairly large fluctuations in static pressure also persist well into the region where the velocity and flow angles have damped out. The reason for the relatively fast mixing of the dynamic velocity fluctuations is that these fluctuations are transmitted by convection with the local velocity of the fluid particles. Conservation of mass and momentum cause two flows (jet and wake) with different radial and tangential velocities and angles entering a radial vaneless diffuser to mix out rapidly. However, dynamic fluctuations in static pressure propagate with the speed of sound and can persist at larger diffuser radius ratios without violating the continuity and momentum equations.
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Infantino, Daniele, Francesca Satta, Daniele Simoni, Marina Ubaldi, Pietro Zunino, and Francesco Bertini. "Phase-Locked Investigation of Secondary Flows Perturbed by Passing Wakes in a High-Lift LPT Turbine Cascade." In ASME Turbo Expo 2015: Turbine Technical Conference and Exposition. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/gt2015-42480.

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The present work describes the experimental investigations carried out at the Aerodynamics and Turbomachinery Laboratory of Genoa University aimed at characterizing the unsteady features of the secondary flows in a High-Lift Low Pressure Turbine cascade perturbed by incoming wakes. The investigations have been carried out at the nominal exit flow Reynolds number of 300000 in a 5-blade large-scale linear cascade. Hot-wire phase-locked ensemble-averaging technique has been applied to analyze in depth the time-dependent velocity and turbulence intensity distributions in a downstream tangential plane during a wake period. A multiple rotation technique has been used in order to measure the three velocity components as well as the Reynolds stress tensor terms. Acquired data are presented in terms of the phase-dependent mean velocity, turbulence and vorticity maps in order to distinguish between the contributions due to incoming wake velocity defect and those due to the turbulence carried by wakes on the phase-dependent secondary flow structures. Results clearly highlight a significant distortion and weakening of the passage vortex when the upstream wake passes through the measuring domain. Also an evident displacement of the passage vortex position has been observed in the wake period. This analysis allows understanding the difference in the three dimensional time mean structures of the exit flow field between the steady and unsteady operations.
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