Experimental Investigation of Characteristics of Wake Related to Linear Compressor Cascade with Turbulence Promoters

In this paper، due to the importance of incoming flow turbulence intensity into combustion chamber، tripping wire effect on the flow wake has been experimentally investigated within a linear compressor cascade. To do this، two wires were implemented along each blade and their effects on average velocity، turbulence intensity and vorticity frequencies at Reynolds number 45500 were accurately considered. To measure wake parameters، single channel hot wire anemometer was used. Turbulence creation in response to the turbulence promoters made the separation to take place within the boundary layer in a distance farther from the edge of attack and also a decrease in wake width was observed. It is found that turbulence promoters increased the maximum turbulence intensity in blades wake and also reduced corresponding frequency in maximum amplitude and the Strouhal number، consequently.