Experimental Investigations on Effectiveness, Heat Transfer Coefficient, and Turbulence of Film Cooling

Numerical simulation of a 2-D jet-crossflow interaction related to film cooling applications: Effects of blowing rate, injection angle and free-stream turbulence

“…The free-stream turbulence is a strong influencing parameter for the turbine blade cooling application. Experimental investigations (Brown & Minty 1975;Ko & Liu 1980) indicated a loss of cooling effectiveness with an increase of free-stream turbulence for both slot and hole injection due to greater mixing of the injected secondary air with the mainstream. Kadotani & Goldstein (1979) reported the effects of free-stream turbulence, both in intensity and scale, on a turbulent jet.…”

Micro film cooling performance

“…Comparison is also made between the current micro film cooling effectiveness with the large-scale film cooling effectiveness reported by others [7], as shown in Fig. 12.…”

“…In the case of micro film cooling process, the PMMA cover plate we used is 0.8 mm in thickness and is very thick. To compare the film cooling effectiveness of the current micro film-cooled device with the one in the large-scale film cooling system [7], the film cooling effectiveness is significantly lower, as shown in Fig. 8.…”

“…Therefore, instead of film cooling method, the film heating method is adopted to measure the film cooling effectiveness. In fact, both the film cooling and the film heating methods have been adopted in the past [2,7,[8][9][10]. The only difference between the film heating method and the film cooling method is the direction of the heat transfer.…”

“…In addition, the relatively thick film jet is expected to rapidly mix with the hot gas in the freestream and reduce its protection effectiveness [6][7][8][9][10]. The current paper presents a design and fabrication procedure by micro-electro-mechanical system (MEMS) techniques that can make a micro film-cooled device which can inject a micro air jet for film cooling purpose.…”