Experimental Study of the Wall Pressure Distribution in a Convergent-Divergent Nozzle with Strut Injection

2020 ◽  
Vol 55 (2) ◽  
pp. 279-290 ◽  
Author(s):  
A. Lakshmi Srinivas ◽  
B. T. N. Sridhar
Keyword(s):  
Experimental Study ◽  
Pressure Distribution ◽  
Wall Pressure

Passive Effusion Cooling in a Rectangular S-Bend Diffuser

2012 ◽  
Author(s):  
B. C. N. Ng ◽  
A. M. Birk
Keyword(s):  
Experimental Study ◽  
Pressure Distribution ◽  
Back Pressure ◽  
Wall Pressure ◽  
Flow Conditions ◽  
Complex Flow ◽  
Atmospheric Flow ◽  
Pressure Distributions ◽  
Outlet Flow ◽  
Recovery Performance

The experimental study considered passive effusion cooling in an S-bend diffusing passage in which ambient cool air was drawn naturally into the S-duct passage with sub-atmospheric flow distributions. Seven-hole pressure probes were used to measure the test section’s inlet and outlet flow conditions that were used to evaluate the performance of the S-bend diffuser. Back-pressure, outlet flow-fields and wall pressure distributions were investigated to study the effects of effusion cooling on the pressure recovery performance of the S-bend diffuser. The study revealed a substantial back-pressure penalty and wall pressure distribution alteration in the S-bend passage with full coverage effusion cooling. The outlet diffuser was shown to be not as effective with effusion cooling. The findings highlighted the importance of the design of effusion holes locations in complex flow passages.

Passive Effusion Cooling in a Rectangular S-Bend Diffuser

2012 ◽  
Vol 134 (9) ◽  
Author(s):  
B. C. N. Ng ◽  
A. M. Birk
Keyword(s):  
Experimental Study ◽  
Pressure Distribution ◽  
Back Pressure ◽  
Wall Pressure ◽  
Flow Conditions ◽  
Complex Flow ◽  
Hole Pressure ◽  
Pressure Distributions ◽  
Outlet Flow ◽  
Recovery Performance

The experimental study considered passive effusion cooling in an S-bend diffusing passage in which ambient cool air was drawn naturally into the S-bend passage with subatmospheric flow distributions. Seven-hole pressure probes were used to measure the test section’s inlet and outlet flow conditions which were used to evaluate the performance of the S-bend diffuser. Back-pressure, outlet flow-fields, and wall pressure distributions were investigated to study the effects of effusion cooling on the pressure recovery performance of the S-bend diffuser. The study revealed a substantial back-pressure penalty and wall pressure distribution alteration in the S-bend passage with full coverage effusion cooling. The outlet diffuser was shown to be not as effective with effusion cooling. The findings highlighted the importance of the design of effusion holes locations in complex flow passages.

scholarly journals Experimental Research of Wall Pressure Distribution and Effect of Micro Jet at Mach 1.5

2019 ◽  
Vol 8 (2S3) ◽  
pp. 1000-1003 ◽  
Keyword(s):  
Adverse Effect ◽  
Flow Field ◽  
Pressure Distribution ◽  
Area Ratio ◽  
Wall Pressure ◽  
Rapid Expansion ◽  
Base Region ◽  
Active Controls ◽  
Circle Diameter

In this paper, a study on the effect of the control on the wall pressure as well as the quality of the flow when tiny jets were employed. The small jet aimed to regulate the base pressure at the base region of the suddenly expanded duct and wall pressure distribution is carried out experimentally. The convergent-divergent (CD) nozzle with a suddenly expanded duct was designed to observe the wall pressure distribution with and without control using small jets. In order to obtain the results with the effect of controlled four tiny jets of 1 mm diameter located at a ninety-degree interval along a pitch circle diameter (PCD) of 1.3 times the CD nozzle exit diameter in the base, region was employed as active controls. The Mach numbers of the rapidly expanded are 1.5. The jets were expanded quickly into an axis-symmetry duct with an area ratio of 4.84. The length-todiameter (L/D) ratio of the rapid expansion duct was diverse from 10 to 1. There is no adverse effect due to the presence of the tiny jets on the flow field as well as the quality of the flow in the duct

scholarly journals An Experimental Study on the Pressure Distribution in Horizontal Gas Wells

2020 ◽  
Vol 16 (6) ◽  
pp. 1243-1258
Author(s):  
Jinbo Liu ◽  
Ziheng Jiang ◽  
Xuezhang Feng ◽  
Ruiquan Liao ◽  
Dianfang Feng ◽  
...  
Keyword(s):  
Experimental Study ◽  
Pressure Distribution ◽  
Gas Wells

Study of Semi-Inverse Problem for the Design of Annular S-Shaped Compressor Transition Duct

2015 ◽  
Author(s):  
Peng Shan ◽  
Jingyuan Wang ◽  
Zhentao Lv
Keyword(s):  
Inverse Problem ◽  
Pressure Distribution ◽  
Static Pressure ◽  
Pressure Coefficient ◽  
Optimal Solution ◽  
Outer Wall ◽  
Wall Pressure ◽  
Design Parameters ◽  
Gradient Distribution ◽  
Static Pressure Distribution

A new aerodynamic design strategy of the S-shaped transition duct between two compressor components was studied. Based on the controlled wall pressure gradient distribution and the wall velocity distribution, a semi-inverse problem of the transition duct was proposed, the corresponding inverse and direct approach codes were developed. To verify the feasibility of this method, two axial-centrifugal compressor transition ducts were designed. The results show that the static pressure distribution on the inner wall and the duct geometry both can be controlled freely by adjusting the inverse design parameters. The designed inner wall pressure distribution can be realized through a numerical matching procedure of the outer wall geometry based on the direct problem. The new design method is practicable that, without searching the optimal solution of the static pressure distribution of the inner wall, the total pressure coefficient can be at least 0.92.

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