This model was created to demonstrate the built-in Diesel Engine Model in RadTherm/MuSES Version 7.0. The engine model can be "driven" using a vehicle speed input curve. The convective effects determined by RadTherm's wind model can also use the speed curve and vehicle heading curve to determine an apparent wind vector. This model included a natural environment with solar loads and apparent wind effects.
The geometry was meshed and assigned to parts for the body, engine, radiator, axles, wheels, tires, frame, exhaust system and trailer. The trailer included an air node and a lumped capacitance node to represent cargo thermal mass.
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Transient Animations
Truck Cab - Low Temperature Range
Small Large (Focus on Cab Temperatures Prior to Hot Soak)
Truck Cab - High Temperature Range
Small Large (Focus on Cab Temperatures during Hot Soak)
Truck Underbody - Low Temperature Range
Small Large (Focus on Underbody Temperatures)
Truck Underbody - High Temperature Range
Small Large (Focus on Exhaust System Temperatures)
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RadTherm's Generic Diesel Engine Model utilizes several parameters to characterize an engine. For this demonstration, engine parameters for an International T444E Diesel Engine were used.
Diesel Engine Model Input Parameters
The engine model can employ a transmission map to determine engine power at various speeds.
Diesel Engine Model Output
Based on the required engine power, the Engine Model determines the following outputs:
- Engine Block Surface Temperature
- Engine Cooling Air Fluid Node
- Exhaust Gas Flow Rate
- Exhaust Gas Fluid Temperature
The exhaust system was modeled in 7 sections, using fluid nodes with advection links through the system. Each side of the exhaust system received 50% of the total exhaust gas flow. The fluid temperature was the Exhaust Gas Fluid Temperature determined by the Diesel Engine Model.
Sample Results
Compare the results curves below to the main input parameter, the vehicle speed curve. The power of this type of modeling in RadTherm is that speed and heading curves can be generated for specific driving schedules, and heat management techniques can be tested under a range of operating conditions.
Click on the images to open a larger copy in a separate window.
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