Mold filling characteristics of Al alloy in vacuum lost foam lowpressure casting (VLFLPC) under counter gravity condition were examined.
试验研究了反重力浇注条件下,铝合金消失模真空低压铸造的充型流动特性。
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The results show that , the ratio of the output power of vaneless counter-rotating turbine can reduce 2.6% at the same turbine efficiency when the lowpressure rotor curves positive.
The way that counter rotating local fan with the characteristics of high efficency, low noise, high pressure and large flow rate is not practical is put forward.