Working-cycle dissolved turbine efficiency with constant and pulse pressure boosting

内燃机的工作过程引起脉动废气流。这会影响排气阀后面的涡轮增压器。脉动影响涡轮机入口处的所有相关量：压力、质量流量和温度。通常，涡轮机是基于稳态记录图来应用的。一个真实的优化只发生在发动机上，需要大量的变量。由于缺乏对涡轮机内部实际流体状态的了解，因此无法获得支持该应用的详细的、基于实验的脉动涡轮机模型。因此，主要原因是缺少表征脉动涡轮机流的测量设备。由于工作量大且需要完整的CAD数据，因此无法选择模拟。在本项目的框架内，将研究表征通过涡轮增压器涡轮机的发动机典型气流的方法。一个新的测量概念将被安装到热气测试台上，并将以不同的方式进行验证（虚拟温度传感器探头、涡轮机测力计、CFD）。此外，调查将得到发动机试验台架调查和发动机过程模拟的支持。该项目的一个主要目标是确定涡轮机压力、涡轮机温度、质量流率和涡轮机扭矩的瞬态值。根据这些值并考虑运输条件，可以计算瞬态涡轮机效率。这为评估涡轮机和脉冲进气的性能开辟了新的可能性。然后将知识和方法应用于两种不同的涡轮增压器涡轮机类型。主要目标是描述涡轮增压器的脉动涡轮机流的新方法，并获得对通过涡轮增压器的流的热力学的新见解，从而允许优化应用。

The working process of internal combustion engines induces a pulsating exhaust gas flow. This impacts the turbocharger sitting right behind the exhaust valves. The pulsation affects all relevant quantities at the turbine entry: ´pressure, mass flow and temperature. Usually turbines are applied based on steady state recorded maps. A real optimization occurs only at the engine and requires a lot of variants. Detailed, experiment based models of pulsating turbines, which support the application, are not available due to the lack of knowledge of the actual fluid state inside the turbine. Main reason therefore is the missing measurement equipment to characterize pulsating turbine flow. Simulations are not an option due to the high effort and the need for complete CAD data. In the frame of this project methods to characterize the engine typical flow through a turbocharger turbine will be investigated. A new measurement concept will be installed onto a hot gas test bench and will be validated in different manners (virtual temperature sensor probe, turbine dynamometer, CFD). Furthermore, the investigation will be bolstered by investigations on engine test benches and by engine process simulations. One main objective of the project is the determination of the transient values for: turbine pressure, turbine temperature, and mass flow rate and turbine torque. Based on these values and under consideration of transport terms the transient turbine efficiency can be calculated. This opens up new possibilities to evaluate the behavior of turbines und pulse admission. The knowledge and methods will then be applied on to two different turbine types of a turbocharger. Main objectives are new methods to describe the pulsating turbine flow of turbocharger and to gain new insight into the thermodynamic of the flow through a turbocharger and there by allow for an optimized application.