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A simple model for tip leakage mixing loss of unshrouded blades for compressible flow is presented. The work draws ideas, is based on the theoretical analysis of the loss by Denton. Relationship for computing the loss is derived, in terms of blade surface static pressure, chordwise distribution of tip clearance, discharge coefficient and total pressure loss coefficient in the tip region. Parameter studies reveal average level and chordwise distribution of the above factors’ contribution to the loss. Results clearly indicate the governing variables and mechanisms which drive tip leakage mixing loss. Combined clearance and blade loading study is developed, most excitedly, an important parameter is put forward, which can reflect synthetically the influence of blade loading and tip clearance distribution on the tip leakage mixing loss.

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