Fuel Supply System with Variable Elevation

This example shows the use of SimHydraulics® to simulate a three-tank fuel supply system where side tanks periodically change elevations during the simulation cycle.

The fuel supply system represented in the example consists of three tanks and an engine. The engine is fed from the central tank, while fuel from the LW tank and the RW tank is pumped to the central tank with respective pumping stations. Each pumping station consists of two centrifugal pumps, connected in parallel, with check valves installed in the pump outlets to prevent back flow. The pumps are driven by prime movers at angular velocity of 120 Hz. The movers are simulated with the ideal angular velocity source.

The central tank bottom is elevated by 36 in with respect to the reference plane, which is drawn horizontally through the entry point of the engine. The side tank bottoms are elevated by 4.2 in each.

The LW and the RW tanks are equipped with the volume control block intended to cut the outlet off if fluid volume in the tank becomes less than preset volume. A similar block in the central tank controls both the tank overfill and the exposure of its highest port. In all tanks, the cutoff is performed with the 2-way valves.

The example simulates the 3000 second cycle, during which each side tank periodically changes its elevation by 28 in both upward and downward. The vertical position of the central tank is assumed to remain the same during the cycle.