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随着增压柴油机的不断发展,柴油机用废气涡轮增压器的压比(膨胀比)不断提高,高压比增压器的研制工作已经开展。国外研制的高压比增压器其压比已达4.5(膨胀比达3.7),我国也已开展了压比为3.5(膨胀比为3.2)高压比增压器的研制工作。增压器通常所采用的单级轴流式涡轮,要求从涡轮进气壳、喷咀、动叶到涡轮排气壳的
With the continuous development of turbocharged diesel engines, the pressure ratio (expansion ratio) of diesel exhaust turbochargers has been continuously raised. The development of high-pressure ratio turbochargers has been carried out. Developed abroad than the supercharger pressure ratio has reached 4.5 (expansion ratio of 3.7), China has also launched a pressure ratio of 3.5 (expansion ratio of 3.2) high-pressure ratio supercharger development work. Single-stage axial turbines, which are commonly used for superchargers, require that the flow from the turbine inlet shell, nozzles, buckets to the turbine exhaust shell