Secondary Flow Loss Reduction in a Turbine Cascade with a Linearly Varied Height Streamwise Endwall Fence

Table 2

Objective functions used for different secondary flow reduction techniques.

Investigator	Secondary flow loss reduction technique	Optimization parameter
Brennan et al. [15]	Endwall profiling	SKEH
Ingram [8]	Endwall profiling	CSKE
Corral and Gisbert [14]	Endwall profiling	SKEH + an exponential function of inlet swirl angle
Bagshaw et al. [16]	Endwall profiling	SKEH
Nagel and Baier [17]	Endwall profiling	Weighted addition of various postprocessor results (averaged loss accounts for the major part)
Duden et al. [18]	Endwall and leading edge modification	Exit flow angle deviation and a secondary flow area with the least possible distance from the endwall
Harvey et al. [19]	Endwall profiling	Cross-passage static pressure gradient on endwall and exit flow angle deviation
Pralsner et al. [20]	Endwall profiling	Total pressure loss coefficient, SKE and TKE (turbulent kinetic energy)
Ingram et al. [9]	Endwall profiling	Exit flow angle deviation
Germain et al. [21]	Endwall profiling	Combination of total pressure loss coefficient and CSKE
Schüpbach et al. [22]	Endwall profiling	CSKE
Moon and Koh [2]	Streamwise endwall fence	Stream wise vorticity