A Chemical Pump that Generates High‐Pressure Gas by Transmitting Liquid Fuel against Pressure Gradient

Autonomous pump against concentration gradient

Using non-equilibrium molecular dynamics and Monte Carlo methods, we have studied the molecular transport in asymmetric nanochannels. The efficiency of the molecular pump depends on the angle and apertures of the asymmetric channel, the environmental temperature and average concentration of the particles. The pumping effect can be explained as the competition between the molecular force field a...

Fuel Tank Capacity and Gas Pump Accuracy

Often when fuel prices rise as they have during 2005, weights and measures officials see an increase in the number of complaints related to the accuracy of gasoline pumps (retail motor-fuel dispensers). Frequently, weights and measures jurisdictions report receiving consumer complaints from motorists who believe they filled their vehicle's fuel tank with more gasoline than the tank is specified...

Numerical Study of Pressure Fluctuation in a Gas- Liquid Two-Phase Mixed-Flow Pump

To explore the pressure fluctuation characteristics in a mixed-flow pump handling a gas-liquid two-phase flow, an unsteady simulation was carried out with ANSYS CFX for the whole flow passage when the inlet gas void fraction (IGVF) was 0%, 5%, and 10%, respectively. Under pure water conditions (IGVF = 0%), the reliability of the simulation was verified by comparing with the experiment in both a...

Diagnosis of fuel pump measurement bias in gas turbine engines

Gasoline Engine Fuel Pump Pressure Nonlinear Function Fuzzy Control

In order to improve the accuracy of electronic fuel injection (EFI) engine fuel pump pressure, according to the characteristics of pump directly driven by motor, a nonlinear mathematical model is built for the fuel supply system of EFI engine pressure control. And then, the nonlinear-function-optimized flow signal is introduced to adjust the parameters of nonlinear function. With the PI control...