ok guys !!! i need to edit this question !!! I have an iris type of valve that is installed between the throttle valve and the intake manifold to restrict flow. the valve is to be fully closed and fully opende based on need. there is no partial opening something like that. what i need is the mathematical equations for the flow rate of air that come from the throttle valve and blocked by the iris valve so that there will not be flow to the intake manifold. i have equations for the mass flow rate of air that come from the throttle valve. but the air will be blocked by the iris valve if the iris valve is in a closed state. how do i drive expression for the air flow inthe intake manifold is zero and the engine will stop ? the attached images are fully open and fully closed conditions of the valve. you can have a look on the youtube link also...
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