Impingement Jet Cooling with Different Stand-Off Distances for Single- and Double-Exit Flows

2014 ◽  
pp. 33-61
Author(s):  
R.S. Amano ◽  
M. Keenan ◽  
S. Ou
Keyword(s):  
Impingement Jet ◽  
Jet Cooling

scholarly journals Study of coupled effect of impingement jet cooling of kerosene with solid structure

2019 ◽  
Vol 62 (11) ◽  
pp. 2021-2028
Author(s):  
MengMeng Du ◽  
FengQuan Zhong ◽  
YunFei Xing ◽  
XinYu Zhang
Keyword(s):  
Solid Structure ◽  
Impingement Jet ◽  
Jet Cooling ◽  
Coupled Effect

Experimental Study of Impingement Jet Cooling Above Pedestal Roughened Channels

2015 ◽  
Author(s):  
G. L. Peacock ◽  
S. J. Thorpe
Keyword(s):  
Heat Transfer ◽  
Heat Transfer Coefficient ◽  
Transfer Coefficient ◽  
Cross Flow ◽  
Surface Heat ◽  
Surface Heat Transfer ◽  
Liquid Crystal Thermography ◽  
Impingement Jet ◽  
Jet Cooling ◽  
Surface Heat Transfer Coefficient

An experimental investigation has been conducted into the use of a combined impingement-pedestal cooling geometry to improve uniformity of surface heat transfer coefficient over traditional combustor liner impingement arrays. Various pedestal arrangements have been investigated by altering the height-to-diameter (H/D) and pitch-to-diameter (P/D) ratios and measurements have been made over a range of impingement jet Reynolds numbers between ∼20 and 40×103. The surface heat transfer coefficient has been determined using a transient liquid crystal thermography measurement technique and the data presented in terms of Nusselt number. A ‘shielded impingement’ concept has also been defined featuring full-height pedestals positioned upstream of each impingement jet and arranged to shield the impingement jets from the developing cross-flow. Aerodynamic measurements have also been made to evaluate the influence of changes to the pedestal geometry on the pressure drop incurred across the different cooling patterns. The analysis indicates superior heat transfer performance can be achieved for the shielded impingement arrangements, with the greatest improvement over equivalent geometries displayed towards the rear of the cooling channel.

A Review of Impingement Jet Cooling in Combustor Liner

2018 ◽  
Author(s):  
Rong Xie ◽  
Hao Wang ◽  
Baopeng Xu ◽  
Wei Wang
Keyword(s):  
Heat Transfer ◽  
Flow Characteristics ◽  
Local Heat Transfer ◽  
Target Surface ◽  
Local Heat ◽  
Research Progress ◽  
Nozzle Geometry ◽  
Impingement Jet ◽  
Jet Cooling ◽  
Combustor Liner

Impingement jet cooling is a promising cooling method in modern dry low emission combustor because of its high local heat transfer coefficient. This paper investigates the recent research progress on impingement jet cooling in combustor liner. Firstly, the different flow characteristics in the different impingement jet flow regions are described. Then, the factors influencing impingement jet cooling are discussed, including flow factor and geometry factor. The researches in a large range of flow parameters, including Reynolds number, Mach number and temperature ratio, are reported. The researches in different geometry parameters, such as nozzle geometry, nozzle-to-nozzle spacing, nozzle-to-target distance and inclined angle, are presented. Next, the crossflow effect in array impingement jet is considered. Due to the crossflow decreases the heat transfer performance, varieties of structures which can restrict the crossflow and improve the channel flow are introduced. Finally, the methods to enhance the impingement jet cooling are presented. These methods focus on retrofitting the nozzle and target surface. The combination of impingement jet cooling with other methods, such as effusion cooling, rib roughened surface, is important development direction in combustor liner in the future.

Total Cooling Effectiveness on a Staggered Full-Coverage Film Cooling Plate With Impinging Jet

2010 ◽  
Author(s):  
Eui Yeop Jung ◽  
Dong Hyun Lee ◽  
Sang Hyun Oh ◽  
Kyung Min Kim ◽  
Hyung Hee Cho
Keyword(s):  
Film Cooling ◽  
Jet Impingement ◽  
Hole Diameter ◽  
Test Plate ◽  
Cooling Effectiveness ◽  
Cooling Plate ◽  
Impingement Jet ◽  
Full Coverage ◽  
Jet Cooling ◽  
Cooling Hole

In the present study, total cooling performance was experimentally investigated on a full-coverage film cooling plate with an impingement jet cooling array. The detailed temperature distributions on the film cooled surface were measured using an infra-red thermographic technique. The test plate was made of polycarbonate (k = 0.2 W/m·K) and an array jet impinged underneath the test plates. The measured cooling effectiveness is a combined result of film cooling on the surface and convective heat transfer by a jet impingement array underneath the test plate. The diameter (d) of both film cooling and impingement jet cooling holes was 5 mm. Both the streamwise and spanwise hole spacing-to-hole diameter ratios (p/d) were 3 on the film cooled plate and impingement nozzle plate. The inclination angles of the film cooling holes and impingement jet holes were 35° and 90°, respectively. The holes on each plate were arranged in a staggered pattern. The jet Reynolds number based on the hole diameter varied from 3,000 to 7,000 and the equivalent blowing rate (M) changed from 0.3 to 0.7. The combined cooling effectiveness was measured by changing the gap distance between the jet plate and the film cooling plate from 1 to 5 times the hole diameter. The staggered film cooling hole arrangement showed a higher film cooling effectiveness than the inline film cooling hole arrangement. As the blowing rate increased, the cooling effectiveness decreased on the front part of film cooling plate for a fixed height to diameter ratio (H/d). The effect of H/d on the total cooling effectiveness was not significant for the fixed blowing rate (M) in the tested range.

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