Film cooling effectiveness and mass/heat transfer coefficient downstream of one row of discrete holes
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In this article, a special naphthalene sublimation technique was used to study the film cooling performance downstream of one row of holes of 35 deg inclination angle with 3d hole spacing and relatively small hole length to diameter ratio (L/d = 6.3).Abstract:
A special naphthalene sublimation technique is used to study the film cooling performance downstream of one row of holes of 35 deg inclination angle with 3d hole spacing and relatively small hole length to diameter ratio (L/d = 6.3). Both film cooling effectiveness and mass/heat transfer coefficient are determined for blowing rates from 0.5 to 2.0 with density ratio of 1.0. The mass transfer coefficient is measured using pure air film injection, while the film cooling effectiveness is derived from comparison of mass transfer coefficients obtained following injection of naphthalene-vapor-saturated air with those from pure air injection. This technique enables one to obtain detailed local information on film cooling performance. The laterally averaged and local film cooling effectiveness agree with previous experiments. The difference between mass/heat transfer coefficients and previous heat transfer results indicates that conduction error may play an important role in the earlier heat transfer measurements.read more
Citations
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Journal ArticleDOI
Film cooling characteristics of a single round hole at various streamwise angles in a crossflow: Part I effectiveness
TL;DR: Yuen and Martinez-Botas as mentioned in this paper investigated the effects of adding inline and staggered rows for each streamwise angle and pitch-to-diameter ratio. But they focused on a single cylindrical hole at the same inclinations.
Journal ArticleDOI
Film cooling downstream of a row of discrete holes with compound angle
Richard J Goldstein,P. Jin +1 more
TL;DR: In this article, a special naphthalene sublimation technique is used to study the film cooling performance downstream of one row of holes of 35° inclination angle and 45° compound angle with 3 diameter hole spacing and relatively small hole length to diameter ratio.
Proceedings ArticleDOI
High Resolution Measurements of Local Heat Transfer Coefficients by Discrete Hole Film Cooling
TL;DR: In this article, a high-resolution IR-thermography technique was used for measuring surface temperature fields and local heat transfer coefficients were obtained from a Finite Element analysis using a flat plate surface downstream a row of cylindrical ejection holes.
Journal ArticleDOI
Film Cooling Performance of Converging-Slot Holes With Different Exit-Entry Area Ratios
TL;DR: In this paper, film cooling performance of two kinds of con verging s lot-hole (console) with different exit-entry area ratios have been measured using a new transient liquid crystal measurement technique which can process the nonuniform initial wall temperature.
Journal ArticleDOI
Numerical approach to hole shape effect on film cooling effectiveness over flat plate including internal impingement cooling chamber
Jr-Ming Miao,Chen-Yuan Wu +1 more
TL;DR: In this paper, the effects of hole shape on the distribution of flow field and adiabatic film cooling effectiveness over a flat plate collocated with two rows of injection holes in staggered-hole arrangement were studied.
References
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Journal ArticleDOI
Film-cooling effectiveness downstream of a single row of holes with variable density ratio
TL;DR: In this article, a row of inclined holes that injected cryogenically cooled air across a flat, adiabatic test plate was used to study the effectiveness of film cooling.
Journal ArticleDOI
A review of mass transfer measurements using naphthalene sublimation
Richard J Goldstein,H. H. Cho +1 more
TL;DR: The naphthalene sublimation method can be used to study mass and heat transfer with confidence for a variety of applications, but with certain restrictions as discussed by the authors, such as high-velocity flows.
Proceedings ArticleDOI
Film Cooling With Compound Angle Holes: Adiabatic Effectiveness
TL;DR: In this paper, film cooling effectiveness was studied experimentally in a flat plate test facility with zero pressure gradient using a single row of inclined holes, which injected high-density, cryogenically cooled air.
Journal ArticleDOI
Film Cooling With Large Density Differences Between the Mainstream and the Secondary Fluid Measured by the Heat-Mass Transfer Analogy
Proceedings ArticleDOI
Film Cooling With Compound Angle Holes: Heat Transfer
TL;DR: In this paper, the authors measured the heat transfer coefficient of a single row of holes laterally directed with a compound angle of 60 degrees, and showed that the results were combined with adiabatic effectiveness results to evaluate the overall performance of the three geometries.