The exhaust pulse energy of engine is capable of driving the asymmetric twin-scroll turbine to run complicatedly in a wider flow range, which significantly causes more difficulty of an asymmetric twin-scroll turbine to match a diesel engine. In the present study, It was initially analyzed that an engine exhaust pulse energy of an asymmetric twin-scroll turbine with a balance valve. First, a pulsating flow model of asymmetric twin-scroll turbine was built to decouple the operation states of the small and large scroll turbines. Second, the experiments of asymmetric twin-scroll turbine were performed on a turbine test rig and an engine performance stand to determine the operation rules of turbine flow parameter, turbine efficiency, blade speed ratio, as well as turbine available energy. Asthe balance valve opens, the flow parameter of twin-scroll would perform more broadly around the swallow capacity curves of equal admission. Moreover, the fully-opened balance valve would make the exhaust pulse strength at the small and large scroll inlets sharply degrade by about 25% and 21%, the cycle turbine efficiency enhance by nearly 3%, the turbine available energy and BSFC degrade by about 8.15% and 2.9% at 800 rpm full load engine condition; At 1100 rpm full load engine condition, the exhaust pulse strength at the small and large scroll inlets only degraded by about 7.2% and 5.8%, the cycle turbine efficiency enhanced by about 4%, the turbine available energy and BSFC improved by about 3.7% and 2.1%. Lastly, this study delved into the distributions of the balance valve opening rate and the pulse strength at the small and large scroll inlets at full engine map.

发动机的排气脉冲能量能够驱动非对称双涡管涡轮在更宽的流量范围内复杂运行，这显着增加了非对称双涡管涡轮匹配柴油机的难度。在本研究中，初步分析了带有平衡阀的非对称双涡管涡轮的发动机排气脉冲能量。首先，建立了非对称双涡旋涡轮脉动流模型，以解耦小型和大型涡旋涡轮的运行状态。其次，在涡轮试验台和发动机性能台上进行了非对称双涡管涡轮试验，确定涡轮流量参数、涡轮效率、叶片速比以及涡轮可用能量的运行规律。当平衡阀打开时，双涡管的流量参数将在同等接纳的吞咽能力曲线周围表现得更广泛。此外，全开平衡阀会使大小涡旋入口处的排气脉冲强度急剧下降约25%和21%，循环涡轮效率提高近3%，涡轮可用能量和BSFC下降约8.15% 和 2.9% 在 800 rpm 满载发动机条件下；在1100转满载发动机工况下，大小涡旋进气道排气脉冲强度仅下降约7.2%和5.8%，循环涡轮效率提高约4%，涡轮可用能量和BSFC提高约3.7%和 2.1%。最后，本研究深入研究了在全发动机图中平衡阀开启率和大小涡旋入口处的脉冲强度分布。