Log in

Relevant bibliographies by topics / Isentropic expansion / Journal articles

To see the other types of publications on this topic, follow the link: Isentropic expansion.

Journal articles on the topic 'Isentropic expansion'

Author: Grafiati

Published: 2 June 2025

Last updated: 31 July 2025

Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles

Select a source type:

Consult the top 50 journal articles for your research on the topic 'Isentropic expansion.'

Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.

You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.

Browse journal articles on a wide variety of disciplines and organise your bibliography correctly.

1

Li, Hui, Wen Li, Xuehui Zhang, et al. "Characteristic of a multistage reheating radial inflow in supercritical compressed air energy storage with variable operating parameters." Proceedings of the Institution of Mechanical Engineers, Part A: Journal of Power and Energy 233, no. 3 (2018): 397–412. http://dx.doi.org/10.1177/0957650918787077.

Full text

Abstract:

In the present study, aerodynamic performance of a four-stage reheating radial inflow turbine, which is adopted in the 1.5 MW supercritical compressed air energy storage system, is analyzed by using the method of integral numerical calculation. Results illustrate that when the inlet total pressure of the first stage is decreased, the expansion ratio of the fourth stage decreases the most. System isentropic efficiency decreases about 1% when the inlet total pressure of the first stage is changed from 7 MPa to 3 MPa, and the fourth stage’s isentropic efficiency decreases about 7%. When the rotat

APA, Harvard, Vancouver, ISO, and other styles

2

Nedanovska, E., G. Nersisyan, C. L. S. Lewis, and D. Riley. "Investigation of magnesium laser ablated plumes with Thomson scattering." Laser and Particle Beams 30, no. 2 (2012): 259–66. http://dx.doi.org/10.1017/s0263034612000018.

Full text

Abstract:

AbstractOptical Thomson scattering has been implemented as a diagnostic of laser ablated plumes generated with second harmonic Nd:YAG laser radiation at 532 nm. Thomson scattering data with both spatial and temporal resolution has been collected, giving both electron density, and temperature distributions within the plume as a function of time. Although the spatial profiles do not match very well for simple models assuming either isothermal or isentropic expansion, consideration of the measured ablated mass indicates an isothermal expansion fits better than an isentropic expansion and indeed,

APA, Harvard, Vancouver, ISO, and other styles

3

Haifei, Zheng, Yu Xiqiao, and Tang Hao. "Study on aero engine thermal performance analysis using a new mathematical model of isentropic expansion (compression) process." Journal of Physics: Conference Series 2764, no. 1 (2024): 012041. http://dx.doi.org/10.1088/1742-6596/2764/1/012041.

Full text

Abstract:

Abstract At present, for the research of aero engine performance, it is necessary to calculate the overall thermal performance of the aero engine at the beginning of the research. For the mathematical model of the isentropic expansion (compression) process, most researchers use the ideal state value to calculate in the mathematical model, so that the calculated results have a certain error compared with the actual value. Therefore, the new isentropic expansion (compression) process mathematical model based on the Φ function is applied in this paper to the technical aero engine overall thermal

APA, Harvard, Vancouver, ISO, and other styles

4

Zhang, Chenghu, Jiahao Gao, Jie Fu, Yaping Li, and Jiyou Lin. "Research on structural parameter optimization and thermal performance of twin-screw expander." International Journal of Low-Carbon Technologies 14, no. 3 (2019): 386–93. http://dx.doi.org/10.1093/ijlct/ctz026.

Full text

Abstract:

Abstract This paper analyzes rotor profile and meshing law of twin-screw expander. Elementary area is calculated by meshing sequence method, and elementary volume is solved by integration. The influence of geometric characteristics such as torsion angle and internal expansion angle of male rotor on the thermal performance of twin-screw expander is studied. The results show the following: reasonably reducing internal expansion angle and positive rotor torsion angle can increase isentropic adiabatic power of twin-screw expander. Taking isentropic adiabatic efficiency as optimization goal, sequen

APA, Harvard, Vancouver, ISO, and other styles

5

Berera, Arjun, and Rudnei O. Ramos. "Absence of isentropic expansion in various inflation models." Physics Letters B 607, no. 1-2 (2005): 1–7. http://dx.doi.org/10.1016/j.physletb.2004.12.028.

Full text

APA, Harvard, Vancouver, ISO, and other styles

6

Petitpas, G., and S. M. Aceves. "The isentropic expansion energy of compressed and cryogenic hydrogen." International Journal of Hydrogen Energy 39, no. 35 (2014): 20319–23. http://dx.doi.org/10.1016/j.ijhydene.2014.10.031.

Full text

APA, Harvard, Vancouver, ISO, and other styles

7

Tsao, Chia-Cheng, Wen-Kai Lin, Kai-Yuan Lai, Savas Yavuzkurt, and Yao-Hsien Liu. "Numerical Investigation of Compression and Expansion Process of Twin-Screw Machine Using R-134a." Energies 16, no. 8 (2023): 3599. http://dx.doi.org/10.3390/en16083599.

Full text

Abstract:

Increasing the efficiency of twin-screw machines is beneficial for gas compression and expansion applications. We used a computation fluid dynamic approach to obtain the flow field and efficiency of a twin-screw machine that used R-134a as the working fluid. The leakage flow and sealing lines were obtained to study their geometrical effects during the compression and expansion process. The effects of the wrap angle (280°, 290°, and 300°) and pressure ratios on the compression efficiency were studied. During the compression process, the volumetric efficiency was more than 70% regardless of the

APA, Harvard, Vancouver, ISO, and other styles

8

Smeyers, P., T. Van Hoolst, I. De Boeck, and L. Decock. "A New Asymptotic Treatment of g-modes of a Star." International Astronomical Union Colloquium 155 (1995): 285–86. http://dx.doi.org/10.1017/s025292110003712x.

Full text

Abstract:

An asymptotic representation of low-frequency, linear, isentropic g-modes of a star is developed without the usual neglect of the Eulerian perturbation of the gravitational potential. Our asymptotic representation is based on the use of asymptotic expansions adequate for solutions of singular perturbation problems (see, e.g., Kevorkian & Cole 1981).Linear, isentropic oscillation modes with frequency different from zero are governed by a fourth-order system of linear, homogeneous differential equations in the radial parts of the radial displacement ξ(r) and the divergence α(r). These equati

APA, Harvard, Vancouver, ISO, and other styles

9

Slemrod, Marshall. "Admissibility of weak solutions for the compressible Euler equations, n ≥ 2." Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences 371, no. 2005 (2013): 20120351. http://dx.doi.org/10.1098/rsta.2012.0351.

Full text

Abstract:

This paper compares three popular notions of admissibility for weak solutions of the compressible isentropic Euler equations of gas dynamics: (i) the viscosity criterion, (ii) the entropy inequality (the thermodynamically admissible isentropic solutions), and (iii) the viscosity–capillarity criterion. An exact summation of the Chapman–Enskog expansion for Grad’s moment system suggests that it is the third criterion that is representing the kinetic theory of gases. This, in turn, may shed some light on the ability to recover weak solutions of the Euler equations via a hydrodynamic limit.

APA, Harvard, Vancouver, ISO, and other styles

10

Lefebvre, Lucie, Ward De Paepe, Mario L. Ferrari, and Alberto Traverso. "Carnot cycle in practice: compensating inefficiencies of ORC expanders through thermal regeneration." E3S Web of Conferences 238 (2021): 10005. http://dx.doi.org/10.1051/e3sconf/202123810005.

Full text

Abstract:

The Organic Rankine Cycle (ORC) is a thermodynamic cycle that can operate with a hot source over a wide range of temperatures, especially with low-grade heat (below 200°C). One of the main limitations for the success of small-scale ORC cycles (few to 100 kWe) is the relatively low isentropic efficiency of the typically used turbomachinery. Low turbine efficiency leads to low ORC cycle performance. To increase the performance of the cycle, the turbine efficiency must be increase, however, this significantly increases the cost of the machinery, making the cycle less profitable. In this work, the

APA, Harvard, Vancouver, ISO, and other styles

11

Pack, D. J., T. J. Edwards, and D. Fawcett. "Applications of Accurate Isentropic Exponent Determination for Fuel Gas Measurement." Journal of Engineering for Gas Turbines and Power 118, no. 3 (1996): 541–46. http://dx.doi.org/10.1115/1.2816681.

Full text

Abstract:

This paper discusses the determination and application of the isentropic exponent to the various thermodynamic processes found in a high-pressure natural gas transmission system. Increasing demands for more precise measurement of natural gas, coupled with the need for greater efficiency and accountability of transportation and processing operations, had led to our research and development efforts into the more precise measurement of gas flow, and the determination of gas thermodynamic properties including isentropic exponent. The isentropic exponent has many applications, some of which include

APA, Harvard, Vancouver, ISO, and other styles

12

Wang, Yuanguang, Shuo Zhou, and Jingtao Guo. "Design Process of Supersonic Isentropic Inlet with Expansion Wave Concept." Procedia Engineering 126 (2015): 184–88. http://dx.doi.org/10.1016/j.proeng.2015.11.212.

Full text

APA, Harvard, Vancouver, ISO, and other styles

13

Zhao, Jia Quan, Da Peng Hu, Pei Qi Liu, Feng Xia Liu, and Jin Ji Gao. "Thermodynamic Analysis a Novel Wave Rotor Refrigeration Cycle." Advanced Materials Research 805-806 (September 2013): 537–42. http://dx.doi.org/10.4028/www.scientific.net/amr.805-806.537.

Full text

Abstract:

As a novel generation of thermal separators, the Wave rotor refrigerator (WRR) has replaced the traditional pressure-wave thermal separator. However, the isentropic refrigeration efficiency still needs to be improved compared with expander. A novel WRR system cycle was built and the system performance was thermal analyzed under various parameters, such as expansion efficiency or compression efficiency of wave rotor. The results are used to compare with the traditional WRR system. It is shown that the advantage provided by this novel cycle over the traditional WRR is an expansion process and a

APA, Harvard, Vancouver, ISO, and other styles

14

Ahmed, Aram Mohammed, and Attila R. Imre. "The effect of recuperator on the efficiency of ORC and TFC with very dry working fluid." MATEC Web of Conferences 345 (2021): 00012. http://dx.doi.org/10.1051/matecconf/202134500012.

Full text

Abstract:

Organic Rankine Cycles (ORC) and Trilateral Flash Cycles (TFC) are very similar power cycles; ideally, they have a reversible adiabatic (isentropic) compression, an isobaric heating, an isentropic expansion and an isobaric cooling. The main difference is that for ORC, the heating includes the full evaporation of the working fluid (prior expansion); therefore, the expansion starts in a saturated or dry vapour state, while for TFC, the heating terminates upon reaching the saturated liquid states. Therefore, for TFT, expansion liquid/vapour state (in bubbly liquid or in vapour dispersed with drop

APA, Harvard, Vancouver, ISO, and other styles

15

Bhatt, Bishan Datt. "Computation of excess isentropic compressibility via Flory's statistical theory to investigate molecular interactions in n-alcohol–benzylamine mixtures." African Journal of Empirical Research 5, no. 4 (2025): 2043–49. https://doi.org/10.51867/ajernet.5.4.170.

Full text

Abstract:

Excess isentropic compressibility is a key thermodynamic property that offers valuable insight into molecular interactions within liquid mixtures. Understanding these interactions is crucial for characterizing solution structure, designing chemical processes, and developing predictive thermodynamic models. Statistical models play a vital role in interpreting thermodynamic behavior by connecting macroscopic properties with molecular-level interactions. They allow for the prediction and analysis of complex mixture behavior while minimizing the need for extensive experimental data. In this study,

APA, Harvard, Vancouver, ISO, and other styles

16

Zongshu, Mei, Chen Peng, and Liu Jianghai. "Numerical analysis of initial cloud of powder dynamic dispersion." Journal of Physics: Conference Series 2478, no. 2 (2023): 022013. http://dx.doi.org/10.1088/1742-6596/2478/2/022013.

Full text

Abstract:

Abstract Numerical simulations were performed to investigate the explosion dispersion characteristics of powder materials with respect to the implicated velocity, and a fluid–solid coupling simulation model of the explosion dispersion process of the initial cloud was established. Explicit dynamics models of Finite-element method and smooth particle hydrodynamics for the detonation driving stage of central charge and the cloud isentropic expansion stages were developed, the pressure loads of the explosive-driven were generated using the user-defined function program, and computational fluid dyn

APA, Harvard, Vancouver, ISO, and other styles

17

Sheng, Wancheng, and Shouke You. "The two-dimensional unsteady supersonic flow around a convex corner." Journal of Hyperbolic Differential Equations 15, no. 03 (2018): 443–61. http://dx.doi.org/10.1142/s0219891618500169.

Full text

Abstract:

The flow around a convex corner is one of the most important elementary flows. In this paper, we are concerned with the two-dimensional (2D) unsteady supersonic flow turning a convex corner. We firstly give the properties of general centered simple for the two-dimensional isentropic irrotational pesudo-steady Euler equations. Then, by using the properties of general centered simple waves, we construct the self-similar solution for the two-dimensional isentropic irrotational supersonic flow around a convex corner and prove that the supersonic flow turns the convex corner by a centered expansion

APA, Harvard, Vancouver, ISO, and other styles

18

Lomesh, Shashi Kant, Vikas Nathan, Madhu Bala, and Inesh Kumar. "Interactions of Drug Doxycycline Hyclate with Galactitol in Aqueous Solutions at Different Temperatures by Volumetric and Acoustic Methods." Zeitschrift für Physikalische Chemie 234, no. 11-12 (2020): 1853–74. http://dx.doi.org/10.1515/zpch-2019-1386.

Full text

Abstract:

AbstractThe experimental values of density, ρ and speed of sound, u of doxycycline hyclate drug (0.002–0.014) mol kg−1 in water and (0.1, 0.2 and 0.4) mol kg−1 of aqueous galactitol solutions at temperatures T = (303.15, 308.15 and 313.15) K and at atmospheric pressure have been reported in the present communication. From the experimental values, various derived parameters such as apparent molar volume (ΦV), apparent molar isentropic compression (ΦK), limiting apparent molar volume ($\phi_{\text{v}}^{\text{o}}$), limiting apparent molar isentropic compression ($\phi_{\text{K}}^{\text{o}}$), li

APA, Harvard, Vancouver, ISO, and other styles

19

Imre, Attila R., Réka Kustán, and Axel Groniewsky. "Thermodynamic Selection of the Optimal Working Fluid for Organic Rankine Cycles." Energies 12, no. 10 (2019): 2028. http://dx.doi.org/10.3390/en12102028.

Full text

Abstract:

A novel method proposed to choose the optimal working fluid—solely from the point of view of expansion route—for a given heat source and heat sink (characterized by a maximum and minimum temperature). The basis of this method is the novel classification of working fluids using the sequences of their characteristic points on temperature-entropy space. The most suitable existing working fluid can be selected, where an ideal adiabatic (isentropic) expansion step between a given upper and lower temperature is possible in a way, that the initial and final states are both saturated vapour states and

APA, Harvard, Vancouver, ISO, and other styles

20

Feidt, Michel, Gheorghe Dumitrascu, and Ana-Georgiana Lupu. "Chemical Modeling of Constant-Volume Combustion of the Mixture of Methane and Hydrogen Used in Spark Ignition Otto Cycles." Energies 16, no. 12 (2023): 4578. http://dx.doi.org/10.3390/en16124578.

Full text

Abstract:

This paper develops a chemical model for a closed constant-volume combustion of a gaseous mixture of methane and hydrogen. Since the combustion is strongly dependent on temperature, pressure and fuel composition, these had chosen the actual corresponding thermodynamic systems in this kind of combustion, i.e., spark ignition (SI) reciprocating engines, to assess combustion parameters and flue gas composition. The actual cycles impose extra restrictive operational conditions through the engine’s-volumetric-compression ratio, the geometry of the combustion volume, the preparation method of the mi

APA, Harvard, Vancouver, ISO, and other styles

21

Medica-Viola, Vedran, Sandi Baressi Šegota, Vedran Mrzljak, and Daniel Štifanić. "Comparison of conventional and heat balance based energy analyses of steam turbine." Pomorstvo 34, no. 1 (2020): 74–85. http://dx.doi.org/10.31217/p.34.1.9.

Full text

Abstract:

This paper presents a comparison of conventional and heat balance based energy analyses of steam turbine. Both analyses are compared by using measured operating parameters from low power steam turbine exploitation. The major disadvantage of conventional steam turbine energy analysis is that extracted energy flow streams are not equal in real (polytropic) and ideal (isentropic) expansion processes, while the heat balance based energy analysis successfully resolved mentioned problem. Heat balance based energy analysis require an increase of steam mass flow rates extracted from the turbine in ide

APA, Harvard, Vancouver, ISO, and other styles

22

Fang, Juan, Olivier Pauluis, and Fuqing Zhang. "Isentropic Analysis on the Intensification of Hurricane Edouard (2014)." Journal of the Atmospheric Sciences 74, no. 12 (2017): 4177–97. http://dx.doi.org/10.1175/jas-d-17-0092.1.

Full text

Abstract:

Abstract An isentropic analysis technique is adopted in this study to investigate the intensification of Hurricane Edouard (2014) predicted by an experimental real-time convection-permitting hurricane analysis and forecast system. This technique separates the vertical mass transport in terms of equivalent potential temperature θe for the rising air parcels at high entropy from the subsiding air at low entropy. It is found that as Edouard intensifies the vertical circulation becomes wider via the expansion of upward (downward) mass flux to higher (lower) θe. In the early developing stages, the

APA, Harvard, Vancouver, ISO, and other styles

23

De Lucia, Maurizio, Giacomo Pierucci, Maria Manieri, et al. "Experimental Characterization of Commercial Scroll Expander for Micro-Scale Solar ORC Application: Part 1." Energies 17, no. 9 (2024): 2205. http://dx.doi.org/10.3390/en17092205.

Full text

Abstract:

In order to reduce greenhouse gas emissions and achieve global decarbonisation, it is essential to find sustainable and renewable alternatives for electricity production. In this context, the development of distributed generation systems, with the use of thermodynamic and photovoltaic solar energy, wind energy and smart grids, is fundamental. ORC power plants are the most appropriate systems for low-grade thermal energy recovery and power conversion, combining solar energy with electricity production. The application of a micro-scale ORC plant, coupled with Parabolic Trough Collectors as a the

APA, Harvard, Vancouver, ISO, and other styles

24

Oumarou Ali, Ababakari, Daniel Broseta, and Dan Vladimir Nichita. "Calculation of Joule-Thomson and isentropic expansion coefficients for two-phase mixtures." Science and Technology for Energy Transition 78 (2023): 20. http://dx.doi.org/10.2516/stet/2023016.

Full text

Abstract:

Joule–Thomson (JT) and isentropic expansion coefficients describe the temperature change induced by a pressure variation under isenthalpic and isentropic conditions, respectively. They are commonly used to model a variety of processes in which either fluid compression or expansion is involved. While a lot of work has been devoted to inferring the JT coefficient from an equation of state when the fluid is a single phase, little attention has been paid to multiphase fluids, where phase equilibrium has to be taken into account; previous work has only addressed the construction on the JT inversion

APA, Harvard, Vancouver, ISO, and other styles

25

Baruah, A., D. K. Saini, and G. Sachdeva. "Exergy investigation of a vapor compression system comprising ejector for isentropic expansion." Journal of Physics: Conference Series 1240 (July 2019): 012125. http://dx.doi.org/10.1088/1742-6596/1240/1/012125.

Full text

APA, Harvard, Vancouver, ISO, and other styles

26

Reis, João Carlos R., Gérard Douhéret, Michael I. Davis, Inger Johanne Fjellanger, and Harald Høiland. "Isentropic expansion and related thermodynamic properties of non-ionic amphiphile–water mixtures." Phys. Chem. Chem. Phys. 10, no. 4 (2008): 561–73. http://dx.doi.org/10.1039/b713806g.

Full text

APA, Harvard, Vancouver, ISO, and other styles

27

Emelyanov, A. N., A. A. Pyalling, and V. Ya Ternovoi. "Investigation of Near-Critical States of Molybdenum by Method of Isentropic Expansion." International Journal of Thermophysics 26, no. 6 (2005): 1985–95. http://dx.doi.org/10.1007/s10765-005-8610-7.

Full text

APA, Harvard, Vancouver, ISO, and other styles

28

Firoozabadi, Abbas, and Huanquan Pan. "Two-Phase Isentropic Compressibility and Two-Phase Sonic Velocity for Multicomponent-Hydrocarbon Mixtures." SPE Reservoir Evaluation & Engineering 3, no. 04 (2000): 335–41. http://dx.doi.org/10.2118/65403-pa.

Full text

Abstract:

Summary Two-phase compressibility and two-phase sonic velocity of hydrocarbon mixtures are needed for a variety of applications in well testing, metering, and seismic exploration. In this work, a thermodynamic model is presented to estimate the two-phase isentropic compressibility and two-phase sonic velocity. The model accounts for the mass transfer between the equilibrium phases and the effect of capillary pressure. The results reveal that isothermal and isentropic compressibilities can be different by a factor of 20 in the two-phase near the retrograde dewpoint. With the exception of the re

APA, Harvard, Vancouver, ISO, and other styles

29

McTaggart-Cowan, Ron, John R. Gyakum, and Richard W. Moore. "The Baroclinic Moisture Flux." Monthly Weather Review 145, no. 1 (2016): 25–47. http://dx.doi.org/10.1175/mwr-d-16-0153.1.

Full text

Abstract:

Abstract As subsaturated air ascends sloping isentropic surfaces, adiabatic expansion results in cooling and relative moistening. This process is an effective way to precondition the atmosphere for efficient moist processes while bringing parcels to saturation, and thereafter acts to maintain saturation during condensation. The goal of this study is to develop a diagnostic quantity that highlights circulations and regions in which the process of parcel moistening by isentropic ascent is active. Among the many features that rely on this process for the generation of an important fraction of the

APA, Harvard, Vancouver, ISO, and other styles

30

Adams, Jacob L., and J. G. Brisson. "Acoustic expanders for use in recuperative cryocoolers." IOP Conference Series: Materials Science and Engineering 1301, no. 1 (2024): 012134. http://dx.doi.org/10.1088/1757-899x/1301/1/012134.

Full text

Abstract:

Abstract An acoustic expander has been developed for use in recuperative cryocoolers. The acoustic expander uses reed-valves to generate a standing acoustic wave from a continuously expanding flow. The mechanical energy from the wave is passively dissipated to the ambient environment. The acoustic expander does not require complex moving parts or control mechanisms at low-temperature; in contrast to piston- or turbo-expanders that require moving displacers or spinning shafts. This expander has demonstrated isentropic expansion efficiencies of 50% for a pressure ratio of 1.4 and expansion effic

APA, Harvard, Vancouver, ISO, and other styles

31

Mat Jusoh, Firdaus, Henry Nasution, Azhar Abdul Aziz, et al. "Performance of Automotive Air-Conditioning System by Using Ejector as an Expansion Device." Applied Mechanics and Materials 819 (January 2016): 216–20. http://dx.doi.org/10.4028/www.scientific.net/amm.819.216.

Full text

Abstract:

An automotive air conditioning system that uses thermal expansion valve (TEV) as an expansion device. The pressure drop from the condenser and evaporator pressure is considered an isenthalpic process (constant enthalpy), where this process causes energy loss (entropy generation) in the expansion process. The ejector recovers energy losses, which was previously lost in the expansion valve, and an ejector can be used to generate isentropic condition in the expansion process. The use of an ejector as an expansion device in this study can reduce power consumption of the compressor and increase coo

APA, Harvard, Vancouver, ISO, and other styles

32

Bel'kov, S. A., V. N. Derkach, S. G. Garanin, et al. "Isentropic expansion of copper plasma in Mbar pressure range at “Luch” laser facility." Journal of Applied Physics 115, no. 3 (2014): 033506. http://dx.doi.org/10.1063/1.4861145.

Full text

APA, Harvard, Vancouver, ISO, and other styles

33

Pedrow, Patrick D., Abutaher M. Nasiruddin, and R. Mahalingam. "Unsteady adiabatic isentropic expansion of gas into vacuum from a toroidal puff valve." Journal of Applied Physics 67, no. 10 (1990): 6109–13. http://dx.doi.org/10.1063/1.345171.

Full text

APA, Harvard, Vancouver, ISO, and other styles

34

Gudarenko, L. F., O. N. Gushchina, M. Y. Zhernokletov, A. B. Medvedev, and G. V. Simakov. "Shock compression and isentropic expansion of porous samples of tungsten, nickel, and tin." High Temperature 38, no. 3 (2000): 413–20. http://dx.doi.org/10.1007/bf02756001.

Full text

APA, Harvard, Vancouver, ISO, and other styles

35

Touil, Kaddour, and Adel Ghenaiet. "Blade stacking and clocking effects in two-stage high-pressure axial turbine." Aircraft Engineering and Aerospace Technology 91, no. 8 (2019): 1133–46. http://dx.doi.org/10.1108/aeat-03-2018-0110.

Full text

Abstract:

Purpose The purpose of this paper is to characterize the blade–row interaction and investigate the effects of axial spacing and clocking in a two-stage high-pressure axial turbine. Design/methodology/approach Flow simulations were performed by means of Ansys-CFX code. First, the effects of blade–row stacking on the expansion performance were investigated by considering the stage interface. Second the axial spacing and the clocking positions between successive blade–rows were varied, the flow field considering the frozen interface was solved, and the flow interaction was assessed. Findings The

APA, Harvard, Vancouver, ISO, and other styles

36

Pagé, Monique, Jean-Yves Huot, and Carmel Jolicoeur. "A comprehensive thermodynamic investigation of water–ethanolamine mixtures at 10, 25, and 40 °C." Canadian Journal of Chemistry 71, no. 7 (1993): 1064–72. http://dx.doi.org/10.1139/v93-142.

Full text

Abstract:

The density, isobaric specific heat capacity, and isentropic compressibility of water–ethanolamine (W–EA) mixtures have been measured at three temperatures (10, 25, and 40 °C) over the entire composition range. The results were used to calculate various thermodynamic excess functions of these mixtures, namely: the excess molar volume [Formula: see text] excess molar isentropic and isothermal compressibilities [Formula: see text] excess molar isobaric and isochoric heat capacities [Formula: see text] and excess molar isobaric expansion [Formula: see text] The corresponding partial molar quantit

APA, Harvard, Vancouver, ISO, and other styles

37

Markina, E. M., V. B. Fokin, and P. R. Levashov. "Atomistic simulation of isentropic expansion of aluminum into a two-phase liquid-gas region." Vestnik Ob"edinennogo instituta vysokikh temperatur 1, no. 1 (2018): 96–100. http://dx.doi.org/10.33849/2018121.

Full text

APA, Harvard, Vancouver, ISO, and other styles

38

Hutchins, T. E., and M. Metghalchi. "Energy and Exergy Analyses of the Pulse Detonation Engine." Journal of Engineering for Gas Turbines and Power 125, no. 4 (2003): 1075–80. http://dx.doi.org/10.1115/1.1610015.

Full text

Abstract:

Energy and exergy analyses have been performed on a pulse detonation engine. A pulse detonation engine is a promising new engine, which uses a detonation wave instead of a deflagration wave for the combustion process. The high-speed supersonic combustion wave reduces overall combustion duration resulting in an nearly constant volume energy release process compared to the constant pressure process of gas turbine engines. Gas mixture in a pulse detonation engine has been modeled to execute the Humphrey cycle. The cycle includes four processes: isentropic compression, constant volume combustion,

APA, Harvard, Vancouver, ISO, and other styles

39

Ujile, Awajiogak Anthony, and Dirina Amesi. "Performance Evaluation of Refrigeration Units in Natural Gas Liquid Extraction Plant." Journal of Thermodynamics 2014 (March 25, 2014): 1–7. http://dx.doi.org/10.1155/2014/863408.

Full text

Abstract:

This paper has applied thermodynamics principles to evaluate the reliability of 390 m3/hr natural gas processing plant. The thermodynamics equations were utilized in the evaluation, characterization, and numerical simulation of key process parameters in natural gas liquid extraction plant. The results obtained show the comparison of the coefficient of performance, compression ratio, isentropic work, actual work, electrical power requirements, cooling water consumption in intercoolers, compressor power output, compressor capacity, and isentropic, volumetric, and mechanical efficiency of the two

APA, Harvard, Vancouver, ISO, and other styles

40

Pan, Tongyang, Jifan Zhang, Jiannan Kang, and Mingcheng Li. "The application of modified thermodynamic system correction method to secondary reheat steam turbine." MATEC Web of Conferences 355 (2022): 02058. http://dx.doi.org/10.1051/matecconf/202235502058.

Full text

Abstract:

In order to calculation the enthalpy of wet steam in the secondary reheat turbine thermal system the thermodynamic system of the secondary reheat steam turbine based on the isentropic ideal expansion process line was corrected, This method simplifies the correction calculation step and increases the accuracy of the correction result. Analysis of the rationality of the improved method shows that: Compared with the existing secondary reheat steam turbine thermal system correction method, the maximum error of the improved thermal system correction method is 0.14%. Therefore, this method can bette

APA, Harvard, Vancouver, ISO, and other styles

41

Bordbar, G. H., S. Hosseini, and A. Poostforush. "Isentropic calculation for thermodynamic properties of polarized liquid 3He by considering the effect of spin-dependent correlation function." International Journal of Modern Physics B 31, no. 13 (2017): 1750097. http://dx.doi.org/10.1142/s0217979217500977.

Full text

Abstract:

Correlations in quantum fluids such as liquid 3He continue to be of high interest to scientists. Based on this prospect, the present work is devoted to study the effects of spin–spin correlation function on the thermodynamic properties of polarized liquid 3He such as pressure, velocity of sound, adiabatic index and adiabatic compressibility along different isentropic paths, using the Lennard–Jones potential and employing the variational approach based on cluster expansion of the energy functional. The inclusion of this correlation improves our previous calculations and leads to good agreements

APA, Harvard, Vancouver, ISO, and other styles

42

Yao, Aidi. "Two-dimensional pseudo-steady supersonic flow around a sharp corner for the generalized Chaplygin gas." AIMS Mathematics 7, no. 7 (2022): 11732–58. http://dx.doi.org/10.3934/math.2022654.

Full text

Abstract:

<abstract><p>In this paper, the expansion problem which arises in a two-dimensional (2D) isentropic pseudo-steady supersonic flow expanding into vacuum around a sharp corner for the generalized Chaplygin gas is studied. This expanding problem catches the interaction of an incomplete centered simple wave with a backward planar rarefaction wave and the interaction of a non-planar simple wave with a rigid wall boundary of the 2D self-similar Euler equations. Using the methods of characteristic decompositions and invariant regions, we get the hyperbolicity in the wave interaction domai

APA, Harvard, Vancouver, ISO, and other styles

43

Marques Muniz, A. L., F. O. Wu, P. S. Jung, M. Khajavikhan, D. N. Christodoulides, and U. Peschel. "Observation of photon-photon thermodynamic processes under negative optical temperature conditions." Science 379, no. 6636 (2023): 1019–23. http://dx.doi.org/10.1126/science.ade6523.

Full text

Abstract:

Statistical mechanics demands that the temperature of a system is positive provided that its internal energy has no upper bound. Yet if this condition is not met, it is possible to attain negative temperatures for which higher-order energy states are thermodynamically favored. Although negative temperatures have been reported in spin and Bose-Hubbard settings as well as in quantum fluids, the observation of thermodynamic processes in this regime has thus far remained elusive. Here, we demonstrate isentropic expansion-compression and Joule expansion for negative optical temperatures, enabled by

APA, Harvard, Vancouver, ISO, and other styles

44

Jain, Animesh, and Luca Magri. "High sensitivity of indirect noise predictions in non-isentropic nozzles." INTER-NOISE and NOISE-CON Congress and Conference Proceedings 265, no. 6 (2023): 1433–40. http://dx.doi.org/10.3397/in_2022_0196.

Full text

Abstract:

In aircraft engine combustors, incomplete mixing and air cooling give rise to flow inhomogeneities. When accelerated through the nozzle guide vane downstream of the combustor, these inhomogeneities give rise to acoustic waves. This is commonly known as indirect combustion noise. When these sound waves are reflected off the outlet and travel upstream of the combustor, they can lead to thermoacoustic oscillations. To predict indirect noise, models proposed in the literature assume the frequency of impinging disturbances to be small (compact nozzle assumptions). However, in reality, the assumptio

APA, Harvard, Vancouver, ISO, and other styles

45

Boyd, I. D., and J. P. W. Stark. "Assessment of Impingement Effects in the Isentropic Core of a Small Satellite Control Thruster Plume." Proceedings of the Institution of Mechanical Engineers, Part G: Journal of Aerospace Engineering 203, no. 2 (1989): 97–103. http://dx.doi.org/10.1243/pime_proc_1989_203_060_01.

Full text

Abstract:

Two computational techniques commonly employed in the calculation of rocket and thruster expansion plumes are assessed. These are the method of characteristics (MOC), which is derived from the continuum Euler equations, and the direct simulation Monte Carlo (DSMC) method, which adopts a discrete particle approach. These techniques vary both in the computational expense and in the accuracy and detail of the solutions that they provide, depending upon the regime of application. The assessment is made with reference to the plume expanding from a small monopropellant hydrazine thruster and concent

APA, Harvard, Vancouver, ISO, and other styles

46

Bernal, Pedro J., and W. Alexander Van Hook. "Apparent molar volumes, isobaric expansion coefficients, and isentropic compressibilities for some non-aqueous carbohydrate solutions." Journal of Chemical Thermodynamics 18, no. 10 (1986): 969–78. http://dx.doi.org/10.1016/0021-9614(86)90154-0.

Full text

APA, Harvard, Vancouver, ISO, and other styles

47

Knudsen, P., and V. Ganni. "Equivalent isentropic expansion efficiency of real fluid subject to concurrent pressure drop and heat transfer." IOP Conference Series: Materials Science and Engineering 278 (December 2017): 012059. http://dx.doi.org/10.1088/1757-899x/278/1/012059.

Full text

APA, Harvard, Vancouver, ISO, and other styles

48

Teng, Han, Wanyang Wu, and Jingjun Zhong. "Research on the Influence of Axisymmetric Endwall on EAT Performance." Energies 14, no. 8 (2021): 2215. http://dx.doi.org/10.3390/en14082215.

Full text

Abstract:

To improve the performance of electrically assisted turbochargers (EATs), the influences of the hub profile and the casing profile on EAT performance were numerically studied by controlling the upper and lower endwall profiles. An artificial neural network and a genetic algorithm were used to optimize the endwall profile, considering the total pressure ratio and the isentropic efficiency at the peak efficiency point. Different performances of the prototype EAT and the optimized EAT under variable clearance sizes were discussed. The endwall profile affects an EAT by making the main flow structu

APA, Harvard, Vancouver, ISO, and other styles

49

Cui, Yibo, Tianhong Zhang, Zhaohui Cen, Younes Al-Younes, and Elias Tsoutsanis. "A Novel Curve-and-Surface Fitting-Based Extrapolation Method for Sub-Idle Component Characteristics of Aeroengines." Aerospace 12, no. 6 (2025): 538. https://doi.org/10.3390/aerospace12060538.

Full text

Abstract:

The component characteristics of an aeroengine below idle speed are fundamental for start-up process simulations. However, due to experimental limitations, these characteristics must be extrapolated from data above idle speed. Existing extrapolation methods often suffer from insufficient utilization of available data, reliance on specific prior conditions, and an inability to capture unique operating modes (e.g., the stirring mode and turbine mode of compressor). To address these limitations, this study proposes a novel curve-and-surface fitting-based extrapolation method. The key innovations

APA, Harvard, Vancouver, ISO, and other styles

50

Whalley, R., M. Ebrahimi, and A. Abdul-Ameer. "High-speed rotor-shaft systems and whirling identification." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 221, no. 6 (2007): 661–76. http://dx.doi.org/10.1243/0954406jmes314.

Full text

Abstract:

The transverse vibrations of shaft-rotor systems are considered. Interconnected assemblies of distributed parameter, compliant shafts, pointwise lumped rotor, and isentropic bearing units, are investigated. Analysis methods for shaft-rotor systems are formulated from the truncated, series expansion, of the rotor model, impedance matrix elements. Frequency domain evaluation of the determinant of the matrix model, enabling accurate validation, is incorporated. An illustrative application for a high speed, turbo-charger rotor system model is presented. Critical whirling speed conditions are ident

APA, Harvard, Vancouver, ISO, and other styles

We offer discounts on all premium plans for authors whose works are included in thematic literature selections. Contact us to get a unique promo code!