2 edition of Numerical studies of reacting and non-reacting underexpanded sonic jets found in the catalog.
Numerical studies of reacting and non-reacting underexpanded sonic jets
Written in English
Thesis (Ph.D.) - Loughborough University, 1998.
|Statement||by Paul Birkby.|
Description. Results of theoretical and experimental studies of the problems concerned super/hypersonic flows around the models of real space vehicle configurations such as "Buran"-orbiter, winged cone (airplane-like body), Clipper space vehicle, Martian planetary probe are presented. Numerical predictions of turbulent underexpanded sonic jets using a pressure-based methodology. Proceedings of the Institution of Mechanical Engineers, Part G: Journal of Aerospace Engineering, (3), pp
Experimental Study of Subsonic and Sonic Jets Controlled by Air Tabs Editorial on the Thematic Issue: Supersonic Flow Control, Shock Waves Optical simulation and fabrication of HfMoN/HfON/Al2O3 spectrally selective coating. The large pressure ratio across the orifice produces an underexpanded jet. Models are placed along the centerline of the jet for testing from Mach 1 to NASA funded research has been done related to spacecraft entering the Martian atmosphere using retropropulsion rockets and reaction control jets.
Analysis of non-reacting and reacting flow inside a jet engine afterburner and parametric studies Analysis of non-reacting and reacting flow inside a jet engine afterburner and parametric studies Maheswara Reddy, N. ; Tulapurkara, E.G. ; Ganesan, V. The objective of the present investigation is to analyse the non-reacting and reacting flow inside a gas turbine engine. In the present paper, we give a brief overview of the studies of supersonic jet flows which were performed recently with the aim of gaining experimental data on the formation of the shock-wave structure and jet mixing layer in such flows. Considerable attention is paid to a detailed description of discharge conditions for supersonic jets, to enable the use of measured data for making a.
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Numerical studies of reacting and non-reacting underexpanded sonic jets Numerical studies of reacting and non-reacting underexpanded sonic jets The objective of this work was to model underexpanded turbulent sonic jets and the lifted diffusion flames which result should ignition by: 2.
A pseudo nozzle approximation has also been developed which replaced underexpanded jets with perfectly expanded supersonic jets and removed the need to compute the shock containing region. The approximation was successfully validated for both reacting and non-reacting underexpanded by: 2.
A Doctoral Thesis. Submitted in partial fulfilment of the requirements for the award of Doctor of Philosophy of Loughborough objective of this work was to model underexpanded turbulent sonic jets and the lifted\ud diffusion flames which result should ignition : Paul Birkby.
Numerical study of the near-field of highly underexpanded turbulent gas jets International Journal of Hydrogen Energy, Vol. 37, No. 22 An experimental investigation on the flow structure and mixture formation of low pressure ratio wall-impinging jets by a natural gas injectorCited by: In this study, the high-resolution numerical simulations of the two-dimensional (2D) multi-component inert and reactive highly underexpanded jets are conducted to quantify the influences of the inj Numerical simulations of inert and reactive highly underexpanded jets: Physics of Fluids: No 3.
MENU. SIGN IN. Influence of nozzle geometry on the near-field structure of a highly underexpanded sonic jet Journal of Fluids and Structures, Vol. 24, No. 2 Numerical Study of Mixing Enhancement in a Supersonic Round Jet. The major themes are numerical simulation of transsonic and supersonic combustion phenomena, the study of supersonic reacting mixing layers, and turbulent combustion.
Emphasis is laid on hyperbolic models and on numerical simulations of hydrocarbon planes with a complete set of chemical reactions carried out in two-dimensional geometries as.
Introduction. Historically, the underexpanded jets have long been studied, particularly by some of the most famous scientists,.They are involved in practical engineering and challenging situations, such as exhaust and plumes of aircrafts and rockets (where the thermal signature, jet noise and screech or flow behavior were studied), and mixing issues in supersonic combustors or.
The current work experimentally investigates the flowfield characteristics of an under-expanded turbulent jet impinging on a solid surface for various nozzle-to-plate distances D j, D j, and D j (D j is the jet hydraulic diameter), and nozzle pressure ratios (NPRs) ranging from 2 to Planar particle image velocimetry (PIV) measurements were performed in the central plane of.
Barrel shocks, Mach disks, and other familiar features of steady underexpanded supersonic jets form inside the jet almost immediately after passage of the flow head. These features are maintained until the pressure in the reservoir decays to sonic conditions.
At low pressures the jets. A numerical study for a supersonic underexpanded argon gas jet driven by a pressure ratio of is described in this work, and the results are compared to experiments. A single phase large-eddy simulation (LES) employing a fully-coupled pressure-based finite volume solver framework is carried out.
The numerical results are validated against experimental Schlieren and particle-image. Underexpanded free jet fires are characterised by a non-reacting near field region upstream of the combusting portion of the jet.
with the distance downstream of the release point separating these two regions being known as the lift-off height of the flame. For high pressure jets the near field region resembles a free underexpanded non-reacting. section used to provide the sonic helium jet. Nominal test conditions for the cold air and sonic helium injector are presented in Table 2.
The facility is operated at a total pressure and tem- perature of L MPa and K respectively and helium is injected either at matched or underexpanded. An Optical and Numerical Characterization of Directly Injected Compressed Natural Gas Jet Development at Engine-Relevant Conditions Compressed natural gas (CNG) is an attractive, alternative fuel for spark-ignited (SI), internal combustion (IC) engines due to its high octane rating, and low energy-specific CO 2 emissions compared.
Numerical investigation of a sonic reaction control jet interacting with the high-speed cross-flow has been carried out over a generic missile body. A mathematical model of sonic and supersonic jets, validated previously by the present authors for the prediction of moderately and highly underexpanded free jets, is used to simulate the near field structure of jets which impact a flat surface orthogonally, and its accuracy assessed by comparing model predictions with experimental data available in the literature.
chemically reacting jet ﬂows. Numerical model employed in this study is the ﬁnite volume. Simulation of underexpanded supersonic jet ﬂows with chemical reactions non-reacting jets with modifications on the non-ideal behaviour of hydrogen at high pressures and presence of highly underexpanded jet structure is validated against large scale experiment by Shell and HSL (Shirvill.
et al., ). A new dimensionless group to correlate 95 experimental data on jet flame length is derived by the similitude. In the present study, DNS method has been extended to investigate the three-dimensional spatially-developing supersonic turbulent spray jet flame, as well as the non-reacting case for comparisons.
The gas-droplet flow system has been captured with the hybrid Eulerian–Lagrangian approach. Takashashi and A. Hayashi, Numerical study on the mixing and combustion of injecting hydrogenjets in a supersonic air flow, AIAA Paper 91– American Institute of Aeronautics and Astronautics, Washington, D.C.
() Google Scholar. Non-reacting Jet in Supersonic Crossﬂow• Sonic jet in Mach 2 crossﬂow• Momentum ratio = • Compared with the experiment from Air Force Research Laboratory (AFRL) by Lin et al. (Journal of Propulsion and Power, ) Crossﬂow Jet Air C2H4 M = M = ρ = kg/m3 ρ = kg/m3 T = K T = K p = 31 kPa p = non-reacting air-air mixing.s These studies have shown that the swept ramp model provides a higher degree of mixing, but at the expense of higher pressure losses, when compared with the unswept ramp model.
In a related study, Hung and Barth9 performed a numerical study of hypersonic flow in the expansion slot of a generic.This study investigates the initial transient hydrodynamic evolution of highly under-expanded slit and round jets.
A closed-form analytic similarity solution is derived for the temporal evolution of temperature, pressure and density at the jet head for vanishing diffusive fluxes, generalizing a previous model of Chekmarev using Chernyi's boundary-layer method for hypersonic flows.