The film cooling effectiveness distribution and its uniformity downstream of a row of film cooling holes on a flat plate are investigated by pressure sensitive paint (PSP) under different density ratios. Several hole geometries are studied, including streamwise cylindrical holes, compound-angled cylindrical holes, streamwise fan-shape holes, compound-angled fan-shape holes, and double-jet film-cooling (DJFC) holes. All of them have an inclination angle (θ) of 35 deg. The compound angle (β) is 45 deg. The fan-shape holes have a 10 deg expansion in the spanwise direction. For a fair comparison, the pitch is kept as 4d for the cylindrical and the fan-shape holes, and 8d for the DJFC holes. The uniformity of effectiveness distribution is described by a new parameter (Lateral-Uniformity, LU) defined in this paper. The effects of density ratios (DR = 1.0, 1.5 and 2.5) on the film-cooling effectiveness and its uniformity are focused. Differences among geometries and effects of blowing ratios (M = 0.5, 1.0, 1.5, and 2.0) are also considered. The results show that at higher density ratios, the lateral spread of the discrete-hole geometries (i.e., the cylindrical and the fan-shape holes) is enhanced, while the DJFC holes is more advantageous in film-cooling effectiveness. Mostly, a higher lateral-uniformity is obtained at DR = 2.5 due to better coolant coverage and enhanced lateral spread, but the effects of the density ratio on the lateral-uniformity are not monotonic in some cases. Utilizing the compound angle configuration leads to an increased lateral-uniformity due to a stronger spanwise motion of the jet. Generally, with a higher blowing ratio, the lateral-uniformity of the discrete-hole geometries decreases due to narrower traces, while that of the DJFC holes increases due to a stronger spanwise movement.
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Effect of Density Ratio on Film-Cooling Effectiveness Distribution and Its Uniformity for Several Hole Geometries on a Flat Plate
Jiaxu Yao,
Jiaxu Yao
State Key Laboratory for Strength and Vibration
of Mechanical Structures,
Xi'an Jiaotong University,
Xi'an, Shaanxi 710049, China
of Mechanical Structures,
Xi'an Jiaotong University,
Xi'an, Shaanxi 710049, China
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Jin Xu,
Jin Xu
State Key Laboratory for Strength and Vibration
of Mechanical Structures,
Xi'an Jiaotong University,
Xi'an, Shaanxi 710049, China
of Mechanical Structures,
Xi'an Jiaotong University,
Xi'an, Shaanxi 710049, China
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Ke Zhang,
Ke Zhang
State Key Laboratory for Strength and Vibration
of Mechanical Structures,
Xi'an Jiaotong University,
Xi'an, Shaanxi 710049, China
of Mechanical Structures,
Xi'an Jiaotong University,
Xi'an, Shaanxi 710049, China
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Jiang Lei,
Jiang Lei
State Key Laboratory for Strength and Vibration
of Mechanical Structures,
Xi'an Jiaotong University,
Xi'an, Shaanxi 710049, China
e-mail: leijiang@mail.xjtu.edu.cn
of Mechanical Structures,
Xi'an Jiaotong University,
Xi'an, Shaanxi 710049, China
e-mail: leijiang@mail.xjtu.edu.cn
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Lesley M. Wright
Lesley M. Wright
Department of Mechanical Engineering,
Baylor University,
Waco, TX 76798-7356
e-mail: lesley_wright@tamu.edu
Baylor University,
Waco, TX 76798-7356
e-mail: lesley_wright@tamu.edu
Search for other works by this author on:
Jiaxu Yao
State Key Laboratory for Strength and Vibration
of Mechanical Structures,
Xi'an Jiaotong University,
Xi'an, Shaanxi 710049, China
of Mechanical Structures,
Xi'an Jiaotong University,
Xi'an, Shaanxi 710049, China
Jin Xu
State Key Laboratory for Strength and Vibration
of Mechanical Structures,
Xi'an Jiaotong University,
Xi'an, Shaanxi 710049, China
of Mechanical Structures,
Xi'an Jiaotong University,
Xi'an, Shaanxi 710049, China
Ke Zhang
State Key Laboratory for Strength and Vibration
of Mechanical Structures,
Xi'an Jiaotong University,
Xi'an, Shaanxi 710049, China
of Mechanical Structures,
Xi'an Jiaotong University,
Xi'an, Shaanxi 710049, China
Jiang Lei
State Key Laboratory for Strength and Vibration
of Mechanical Structures,
Xi'an Jiaotong University,
Xi'an, Shaanxi 710049, China
e-mail: leijiang@mail.xjtu.edu.cn
of Mechanical Structures,
Xi'an Jiaotong University,
Xi'an, Shaanxi 710049, China
e-mail: leijiang@mail.xjtu.edu.cn
Lesley M. Wright
Department of Mechanical Engineering,
Baylor University,
Waco, TX 76798-7356
e-mail: lesley_wright@tamu.edu
Baylor University,
Waco, TX 76798-7356
e-mail: lesley_wright@tamu.edu
1Corresponding author.
2Present address: Turbine Heat Transfer Laboratory, Department of Mechanical Engineering, Texas A&M University, College Station, TX 77843-3123.
Contributed by the International Gas Turbine Institute (IGTI) of ASME for publication in the JOURNAL OF TURBOMACHINERY. Manuscript received May 31, 2018; final manuscript received October 18, 2018; published online January 22, 2019. Editor: Kenneth Hall.
J. Turbomach. May 2019, 141(5): 051008 (10 pages)
Published Online: January 22, 2019
Article history
Received:
May 31, 2018
Revised:
October 18, 2018
Citation
Yao, J., Xu, J., Zhang, K., Lei, J., and Wright, L. M. (January 22, 2019). "Effect of Density Ratio on Film-Cooling Effectiveness Distribution and Its Uniformity for Several Hole Geometries on a Flat Plate." ASME. J. Turbomach. May 2019; 141(5): 051008. https://doi.org/10.1115/1.4041810
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