山东理工大学学报（自然科学版）

利用GT-SUITE软件建立机械涡轮复合增压系统，在原四缸增压柴油机缸径×冲程为100 mm×100 mm的基础上加装了串联式动力涡轮系统，使其回收的能量通过变速机构传递给曲轴，通过研究外特性工况下动力涡轮的喷嘴环叶片开度和传动比对复合增压系统整机性能的影响，使整机功率最大。结果表明：(1)动力涡轮传动比固定为30,则喷嘴环叶片开度为100%时各个转速下的整机功率最大；加装动力涡轮后，转速为1 200、1 600、2 000 r/min时整机功率比原机功率分别低2.17%、4.14%、0.97%,转速为2 600、3 000 r/min时整机功率比原机功率分别高1.53%、3.46%。(2)喷嘴环叶片开度固定为100%,则动力涡轮传动比为15时整机功率最大；转速为1 200、1 600、2 000 r/min时整机功率比原机功率分别低1.45%、3.20%、0.14%,转速为2 600、3 000 r/min时整机功率比原机功率分别高2.51%、3.96%。

Using GT-SUITE software, a mechanical turbocharger compound system was established. Based on the original four-cylinder turbocharged diesel engine with bore × stroke of 100 mm × 100 mm, a series-connected power turbine system was incorporated. The recovered energy is transmitted to the crankshaft via a variable-speed mechanism. The impacts of nozzle ring vane opening and gear ratio on the overall performance of the compound boost system under external characteristic conditions were investigated to maximize the power output. Results indicate:(1) With a fixed power turbine gear ratio of 30 and nozzle ring vane opening at 100%, the overall system power reaches its maximum. After adding the power turbine, at engine speed of at 1 200, 1 600, and 2 000 r/min, the overall system power is 2.17%, 4.14%, and 0.97% lower than that of the original engine, respectively. At 2 600 and 3 000 r/min, it is 1.53% and 3.46% higher, respectively.(2) With the nozzle ring vane opening fixed at 100% and the power turbine gear ratio set to 15, the overall system power reaches its maximum. At speeds of 1 200, 1 600, and 2 000 r/min, the overall system power is 1.45%, 3.20%, and 0.14% lower than that of the original engine power, respectively. At speeds of 2 600 and 3 000 r/min, it is 2.51% and 3.96% higher, respectively.