MODELLING OF FLOW IN BIOGAS MIXER
BY FLUENT
(By GATEC)
This is a guide to establish a model to calculate the flow through biogas-air mixer for internal combustion engine running on biogas fuel.
The paper consists of the following parts:
1. Diagrams of mixer
The mixer consists air entrance, biogas supply holes, mixture chamber, throttle as following figure.
2. Establishing model in GAMBIT
– Calculating space and meshing
– Establishing boundary conditions
3. Solving in FLUENT
– Initial parameters and boundary conditions values
– Solving equations system
4. Rusults display
Flow Velocity Velocity Contours
Velocity Vectors Pressure
CH4 Concentration O2 Concentration
Flow Velocity Variation at Different Mixer Sections5. Modifying conditions of calculating
Basing on initial model, we can proceed the calculation in different cases: Biogas compositions, Biogas pressure, engine speed, admission temperature, throttle position…
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