How to calculate the flow rate?

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SUMMARY

This discussion focuses on calculating the mass flow rate of air through a valve installed between the throttle body and intake manifold of an engine. The key method involves using an anemometer to measure air velocity, which is then used to determine flow rate in a restricted area based on the ratio of cross-sectional areas. The mathematical modeling of an iris-type valve, which adjusts its area to control airflow, is essential for understanding engine performance under varying conditions.

PREREQUISITES
  • Understanding of fluid dynamics principles
  • Familiarity with anemometer operation and measurement techniques
  • Knowledge of mathematical modeling and equations related to airflow
  • Basic concepts of engine mechanics and throttle body function
NEXT STEPS
  • Research the Bernoulli equation for fluid flow analysis
  • Learn about the principles of airflow measurement using anemometers
  • Study mathematical modeling techniques for dynamic systems
  • Explore the impact of valve geometry on airflow in internal combustion engines
USEFUL FOR

Engineers, automotive technicians, and students in mechanical engineering or fluid dynamics who are interested in optimizing engine performance and understanding airflow dynamics in automotive applications.

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A valve is installed between the throttle body and intake manifold and decrease its area to restrict the flow. How do I analyze the mass flow rate of air in the decreasing area to know the engine working condition at a minimum valve area?
 
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Place an anemometer in the air stream to measure its velocity. The flow rate in the restricted area will be proportional to the ratio of the two air stream cross sections.
 
AZFIREBALL said:
Place an anemometer in the air stream to measure its velocity. The flow rate in the restricted area will be proportional to the ratio of the two air stream cross sections.
I need to model the scenario mathematically...do you have the idea how do i model it?
 
I need to mathematically model a valve installed between the throttle body and the intake manifold. the valve is an iris type whose area decrease or increase as needed. when the valve is open the air can flow freely from the throttle body to the intake manifold. but when the area get decreasing the flow will be restricted and when the area becomes zero the engine will stop. so how do i mathematically model and drive equation for this type of scenario?
 

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