WAVE_渦輪增壓匹配仿真培訓資料

1、 Turbocharging -IntroductionA turbocharger is a device that recovers energy from one moving fluid stream and uses it to add energy to another moving fluid streamIn automotive applications, a turbocharger can be used to recover waste energy from the engines exhaust gases and then use that energy to c

2、ompress the air at the engine's intakeBy increasing the density of the intake air the volumetric efficiency of the engine is increasedA supercharger is similar to a turbocharger but the compressor is driven by the engine rather than a by an exhaust gas turbineLike superchargers, turbochargers in

3、crease engine power with little increase in weight, but operate without the parasitic loss incurred by superchargers because they operate using waste energy. Turbocharging -IntroductionA turbocharger is a relatively complex device that relies on the aerodynamic performance of of the rotor blades to

4、extract and add energy to and from the fluid stream.Accurately simulating a fully virtual turbocharger requires a time consuming, complex 3D CFD analysisFor this reason WAVE currently does not attempt to predict turbo performance, but instead relies on steady state performance maps provided by the t

5、urbo manufacturersCompressor SectionCompressor HousingTurbine HousingTurbine Exhaust Gas OutletTurbineExhaust Gas InletCompressor Air DischargeCompressor Ambient Air InletCompressor WheelTurbine WheelTurbine Section Diesel TC TutorialDouble clicking on the compressor brings up the compressor panel“D

6、iameter” scalar:mass flow = “Diameter” 2speed = 1 / “Diameter”“Mass Flow” scalar:Direct mass flow scaling“Efficiency” scalar:Complete contour map scaled Pressure ratio definition:Usually Total-to-Total (must be same as raw dataCompressor file name:As specified in TCMAPWe will look at how these maps

7、are created shortly. Diesel TC TutorialDouble clicking on the turbo shaft brings up the turbo shaft panelMoment of inertia“-1”, unless real value is known “Balanced” (TC“Gear” (SC“Fixed” (driven byexternal power sourceInitial turbo speed (TC:NULL if “Gear”Input value if “Fixed”Here, use crpmPlease n

8、ote: The moment of inertia is the combined inertia of turbine, compressor and shaft. Diesel TC TutorialDouble clicking on the Turbine brings up the Turbine panelWastegate “ON”Area = wg (0 for nowUsed for control of boost pressure“Diameter” scalar:Mass flow = “Diameter” 2Speed = 1 / “Diameter”“Mass F

9、low” scalar:Direct mass flow scaling“Efficiency” scalar:Complete contour map scaled Pressure ratio definition:Usually Total-to-Static (must be same as raw dataTurbine file name:As specified in TCMAPturbine map available via a TAG Intercooler geometryAn intercooler can be modelled as a simple duct bu

10、ndle or as a more complicated component constructed from several ducts and YJunctionsGenerally the simpler of the two approaches will be adequate, however the more detailed model will be able to capture the resonances which may be important for some configurationsOnce the geometry has been created the intercooler model will need tuning to deliver the correct pressure drop and effectivenessThe conventional way of tuning is to create a flow bench model of the intercooler, set the boundary conditions to actual values and then a