One useful propeller mathematical model for MAV

A model for Micro Air Vehicles (MAV) propeller performance evaluation is proposed and investigated. This model is derived on the basis of simple analytical relationships and is examined on a set of experimental data. It allows to predict the main propeller characteristics (for example, thrust coefficient, power coefficient, efficiency as...

Comparison of water jets and conventional propeller jets

Conventional ship propulsion systems and hydro jets differ in many ways. However, they are both responsible for sailing and manoeuvring of ships in a forward or reverse direction. The hydrodynamic jet is what they have in common, but the characteristics of the jets differ. For example, the outflow velocity of hydro jets is much higher than the...

CFD analysis of flow in the solid propellant start system of a liquid propellant engine

Starters are mechanisms that are used for generating the working fluid for initial rotation of LPE (Liquid Propellant Engines) turbopumps. The function of the start system is preparation of initial power for starting a turbine. This turbine is attached to the fuel and oxidizer pumps. When these pumps work in a suitable case, the required power...

Simulation of the internal ballistics of a liquid propellant engine start system in comparison with experimental verification

There are several methods for starting a complex mechanical system, for example a liquid propellant engine. One of common methods is the use of solid propellant gas generator that is named solid propellant starter. In this method, a solid propellant motor is used for gas generating and leading it towards power generation turbine. The turbine as...

Investigation of the effect of two-components injectors arrangement on injecting rate in the combustion chamber of a liquid propellant engine

In liquid propellant engines, the propellants (fuel and oxidizer) after passing the injectors, are injected to combustion chamber. Generally, in liquid propellant engines, two types of injectors - direct flow and centrifugal flow - are used. The direct flow injector, actuates as an orifice. The input flow to a centrifugal injector, gets the...