Project - Steady state simulation of flow over a throttle body

Aim:

In this Project, a steady flow analysis in made on the flow of air through the throttle body.

Theory:

A Throttle valve (a) is used for increasing and decreasing the flow of fuel to the engine where the control signal is send from the motion of accelerator and the further flow control as shown in the following figure(b).

Case Setup:

For this pupose case is setup using the provided geometry.

After pre-poscessing using turbulance modelling as RNG k-epsilon, meshing and post processing results are viewed in PARAVIEW.

Mesh:

As can be seen from the figure below, fixed embedding is used for meshing purposes around the throttle valve, a base mesh of 2e-03 is used, with the embedding scale of 3.

This would definitly increase the number of cells and simulation time but would result in very detailed view around the throttle valve.

Mass flow rate vs No. of Cycles Plot:

The mass flow rate at the inlet is equal to the mass flow rate at the outflow.

Total Pressure vs No. of Cycle:

The total pressure at inlet is 1.5 bar whereas at the outlet 1 bar.

Velocity vs No. of Cycles Plot:

As could be seen the velocity at the inlet is slightly less than that at outlet. It could be said that the small spaces between the throttle plate and the elbow could be the reason for this slight increase.

Pressure Contour:

From the following graph, its visible that the pressure that pressure at the upstream of the throttle(where the air strikes before sliding above it) is greater than that of the downstream end and spaces between the throttle plate and elbow.

Velocity Contour:

In accordance with the Pressure contour, velocity contour shows that the velocity is comparatively higher at the spaces between the throttle plate and elbow than the striking and trailing end of the throttle plate.

Moreover in the below images it could be observed that a wake region is build at the trailing edge of the throttle plate.

Streamline Plot with Pressure at the Throttle plate and Velocity as streamlines Data: