Experimental and Numerical Investigation of Impingement Cooling with Spent Flow in the Blade Leading Edge

摘要

A leading edge model with 10 inline jets and concave target was experimented with transient liquid crystal method. Seven CFD methods were tested based on both the experimental contour and the uniformity of Nusselt numbers. The Reynolds number ranges from 10,000 to 20,000. Strong spent flow shifts from the stagnation point and weaken the impingement heat transfer. The heat transfer coefficients increase with Reynolds number but different work conditions show similar heat transfer distribution. Half CFD models, the RNG k -ω model and the k-ω SST model did not work well because of the flow instability and asymmetry nature. The Realizable k-ω model is efficient and accurate for the leading edge impingement.