Chemkin Pro 2020 R2: DI Engine Model

- July 12, 2023 at 9:06 pm
  
  gandolf
  Subscriber
  
  I am modifying the DI engine model to use a constant volume profile to calculate the temperature drop associated with injecting different fluids. I turned off heat transfer and I am using a single injection of n-heptane. I'm just confused about why after an initial drop in temperature, the temperature increases until a steady point. Any help is appreciated.
- July 17, 2023 at 3:43 pm
  
  jcooper
  Ansys Employee
  
  Hi Gandolf:
  Without seeing the setup, it is difficult to answer this question. It looks like the temperature was initialized to 800 and then influenced by colder inlet stream (possibly intake air?), before increasing again due to combustion. I would try post-processing the run at different points to understand the cause.
  Best Regards,
  Judy