Reconstruction of the supersonic underexpanded jet flow parameters by the velocity and total pressure fields measurements results

2019 ◽  
Author(s):  
I. N. Kavun ◽  
I. V. Menshchikova ◽  
A. A. Pivovarov
Keyword(s):  
Total Pressure ◽  
Jet Flow ◽  
Underexpanded Jet ◽  
Flow Parameters ◽  
Pressure Fields ◽  
Supersonic Underexpanded Jet

On the Impingement of Supersonic Jet on a Normal Flat Surface

1982 ◽  
Vol 33 (3) ◽  
pp. 199-218 ◽  
Author(s):  
B.N. Pamadi
Keyword(s):  
Flat Surface ◽  
Supersonic Jet ◽  
Improved Method ◽  
Normal Surface ◽  
Underexpanded Jet ◽  
Flow Parameters ◽  
Supersonic Underexpanded Jet ◽  
Method Of Integral Relations ◽  
Integral Relations ◽  
Good Agreement

SummaryAn improved method, based on one strip approximation of the method of integral relations which was reported originally by Belov, Ginzburg and Shub, is presented for the calculation of flow parameters in the impingement region of a supersonic, underexpanded jet striking a normal surface located within the first cell. The results are presented for two impingement conditions and found to be in good agreement with the experimental data.

scholarly journals Структура течения и колебания давления при взаимодействии сверхзвуковой недорасширенной струи газа с трубной полостью

2020 ◽  
Vol 90 (8) ◽  
pp. 1254
Author(s):  
К.Н. Волков ◽  
В.Н. Емельянов ◽  
А.В. Ефремов ◽  
А.И. Цветков
Keyword(s):  
Flow Field ◽  
Gas Flow ◽  
Piezoelectric Sensors ◽  
Gas Jet ◽  
Pressure Oscillations ◽  
Underexpanded Jet ◽  
Longitudinal Modes ◽  
Flow Parameters ◽  
Supersonic Underexpanded Jet ◽  
Physical Pattern

Supersonic jets are widely used in devices based on the phenomenon of a self-oscillating process that occurs when a gas flow interacts with circular cavities (gas-jet sound emitters). The mechanisms of maintaining undamped pressure oscillations and determining the flow field in the tube cavity during the interaction of a supersonic underexpanded jet with cavity are considered. The physical pattern of the flow in the cavity of a gas-jet emitter is discussed, the existence of odd longitudinal modes is shown, and wave diagrams are proposed for describing the flow in odd longitudinal modes. The wave diagrams are based on the analysis of the signals of piezoelectric sensors, recording pressure oscillations in the tube cavity. The calculation of the flow parameters in the tube cavity in longitudinal modes is based on the flow velocity and speed of sound diagram.

Flow Stucture of Supersonic Underexpanded Jet With Microjets Injection

2013 ◽  
Vol 8 (1) ◽  
pp. 44-55
Author(s):  
Dmitriy Gubanov ◽  
Valeriy Zapryagaev ◽  
Nikolay Kiselev
Keyword(s):  
Flow Structure ◽  
Numerical Study ◽  
Mixing Layer ◽  
Supersonic Jet ◽  
Wave Structure ◽  
Streamwise Vortices ◽  
Jet Mixing ◽  
Underexpanded Jet ◽  
Supersonic Underexpanded Jet ◽  
The Impact

Experimental and numerical study of transversal microjets injection influence on the supersonic underexpanded jet flow structure has been performed. Data of measurements and calculation have acceptable agreement. Interaction of microjets with main supersonic jet sets to a decrease of an initial gasdynamic region. Microjets lead to a longitudinal streamwise vortices generation and a mushroom-like flow structures create on an external jet mixing layer. Dissipation of longitudinal streamwise vortices was observed at the second jet cell. Complex gasdynamic flow structure of the supersonic underexpanded jet interacting with supersonic microjets has been studied for the first time. This structure contains system of complex chock waves and expansion waves spreading from the position of the impact microjets/main jet localization place. Future of interaction process a chock-wave structure of main jet with additional shock waves has been studied

Effect of Wind Directions on the Thermal Performance of Three Aligned NDDCT: Parallel and Perpendicular Directions

2012 ◽  
Vol 232 ◽  
pp. 218-222
Author(s):  
Samad Ghafarigousheh ◽  
Ali Akbar Golneshan
Keyword(s):  
Numerical Model ◽  
Thermal Performance ◽  
Cooling Tower ◽  
Cooling Towers ◽  
Flow Parameters ◽  
Pressure Fields ◽  
Connection Line

In this paper a 3-D numerical model is used to investigate the thermal performance of a three aligned unit of NDDCT under crosswind condition. The computed results show that, there are major differences in computed velocity patterns and pressure fields around the cooling tower due to neighboring of a number of cooling towers will result considerable changes in computed flow parameters hence; the thermal performance losses for the single tower under crosswind are superior to those when this towers are incorporated in aligned arrangement. Results also show that the best thermal performance of the three aligned NDDCT is achieved when the crosswind is directed along the towers connection line.

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