The effects of turbocharger (T/C) rotational inertia on engine and turbine performance under transient and steady engine conditions were analyzed in a 2.0 L 4-cylinder turbocharged-gasoline direct injection (T-GDI) engine. The test T/Cs consisted of heavy and light compressor wheels (C/W) and turbine wheels (T/W). The study was conducted in two research stages. First, transient engine load tests were conducted to evaluate the effect of T/C rotational inertia on transient response of the T/C, combustion performance, and fuel consumption. Seconds, steady engine load tests were conducted to find out if a light inertia T/C can run at higher efficiency under the same exhaust pulsating flow conditions within one engine cycle. In order to evaluate the engine on-board turbine instantaneous performances in the units of crank angle degree (CAD), T/C rotation speed and pressure data were measured in the experiment. The instantaneous exhaust gas mass flow rate and the temperature of upstream and downstream of the turbine were extracted by 1-D simulation. Turbine efficiency and mass flow rate parameters were calculated by combining these data. In the results, there existed positive effects of light inertia T/C on response and specific fuel consumption under transient conditions. It was also found that the light inertia T/C could show higher T/C speed fluctuation under the same exhaust pulsating flow conditions. Consequently, blade speed ratio (BSR) and turbine efficiency of light inertia T/C were partially higher than that of conventional one. However, it was not led to higher engine efficiency.

在2.0 L四缸涡轮增压汽油直喷（T-GDI）发动机中，分析了涡轮增压器（T / C）旋转惯性对瞬态和稳定发动机条件下发动机和涡轮性能的影响。测试T / C由重型和轻型压缩机轮（C / W）和涡轮机轮（T / W）组成。该研究在两个研究阶段进行。首先，进行了瞬态发动机负载测试，以评估T / C旋转惯性对T / C瞬态响应，燃烧性能和燃料消耗的影响。其次，进行了稳定的发动机负载测试，以发现轻惯性T / C是否可以在一个发动机循环内的相同排气脉动流量条件下以更高的效率运行。为了以曲轴角度（CAD）为单位评估发动机车载涡轮的瞬时性能，在实验中测量了T / C旋转速度和压力数据。通过一维仿真提取了瞬时废气质量流量和涡轮上游和下游的温度。通过结合这些数据来计算涡轮效率和质量流率参数。结果表明，在瞬态条件下，光惯性T / C对响应和特定燃料消耗具有积极影响。还发现在相同的排气脉动流动条件下，光惯性T / C可能显示出更高的T / C速度波动。因此，叶片惯性比T / C的叶片速度比（BSR）和涡轮效率部分高于常规叶片。但是，这并未导致更高的发动机效率。通过一维仿真提取了瞬时废气质量流量和涡轮上游和下游的温度。通过结合这些数据来计算涡轮效率和质量流率参数。结果表明，在瞬态条件下，光惯性T / C对响应和特定燃料消耗具有积极影响。还发现在相同的排气脉动流动条件下，光惯性T / C可能显示出更高的T / C速度波动。因此，叶片惯性比T / C的叶片速度比（BSR）和涡轮效率部分高于常规叶片。但是，这并未导致更高的发动机效率。通过一维仿真提取了瞬时废气质量流量和涡轮上游和下游的温度。通过结合这些数据来计算涡轮效率和质量流率参数。结果表明，在瞬态条件下，光惯性T / C对响应和特定燃料消耗具有积极影响。还发现在相同的排气脉动流动条件下，光惯性T / C可能显示出更高的T / C速度波动。因此，叶片惯性比T / C的叶片速度比（BSR）和涡轮效率部分高于常规叶片。但是，这并未导致更高的发动机效率。通过结合这些数据来计算涡轮效率和质量流率参数。结果表明，在瞬态条件下，光惯性T / C对响应和特定燃料消耗具有积极影响。还发现在相同的排气脉动流动条件下，光惯性T / C可能显示出更高的T / C速度波动。因此，叶片惯性比T / C的叶片速度比（BSR）和涡轮效率部分高于常规叶片。但是，这并未导致更高的发动机效率。通过结合这些数据来计算涡轮效率和质量流率参数。结果表明，在瞬态条件下，光惯性T / C对响应和特定燃料消耗具有积极影响。还发现在相同的排气脉动流动条件下，光惯性T / C可能显示出更高的T / C速度波动。因此，叶片惯性比T / C的叶片速度比（BSR）和涡轮效率部分高于常规叶片。但是，这并未导致更高的发动机效率。叶片转速比（BSR）和涡轮机的光惯性T / C效率部分高于传统技术。但是，这并未导致更高的发动机效率。叶片速比（BSR）和涡轮机的光惯性T / C效率均比传统技术高。但是，这并未导致更高的发动机效率。