Evidence of Breakthrough Energy. Impeller. An impeller (also written as impellor[1] or impellar) is a rotor used to increase (or decrease in case of turbines) the pressure and flow of a fluid. An impeller for a dam turbine generator. Impellers in pumps[edit] Several different types of pump impellers. Rotor of the impeller pump (cooling system) of an outboard engine. (Coin for comparison, diameter 16.25 mm.) The impeller made out of cast material in many cases may be called rotor, also. It is cheaper to cast the radial impeller right in the support it is fitted on, which is put in motion by the gearbox from an electric motor, combustion engine or by steam driven turbine.
Heart pumps in medicine[edit] In a failing heart, mechanical circulatory devices often utilize a continuous axial-flow impeller pump design.[2] Impeller Types[edit] OpenSemi OpenClosed Impellers in Centrifugal Compressors[edit] The main part of a centrifugal compressor is the impeller. Impellers in water jets[edit] Compare to propeller and jet aircraft engines. Magnetohydrodynamics. The sun is an MHD system that is not well understood. The fundamental concept behind MHD is that magnetic fields can induce currents in a moving conductive fluid, which in turn creates forces on the fluid and also changes the magnetic field itself.
The set of equations which describe MHD are a combination of the Navier-Stokes equations of fluid dynamics and Maxwell's equations of electromagnetism. These differential equations have to be solved simultaneously, either analytically or numerically. History[edit] The first recorded use of the word magnetohydrodynamics is by Hannes Alfvén in 1942: "At last some remarks are made about the transfer of momentum from the Sun to the planets, which is fundamental to the theory (§11). The ebbing salty water flowing past London's Waterloo Bridge interacts with the Earth's magnetic field to produce a potential difference between the two river-banks. Ideal and resistive MHD[edit] MHD Simulation of the Solar Wind Ideal MHD equations[edit] In the following, Magnetohydrodynamic. The Yamato 1 on display in Kobe, Japan. The first known working prototype. The front of the Yamato 1 A MHD thruster from the boat, at the Ship Science Museum in Tokyo.
A view through a tube in the thruster off Yamato I, at the Ship Science Museum in Tokyo. A view of the end of the thruster unit from Yamato I, at the Ship Science Museum in Tokyo. A magnetohydrodynamic drive or MHD propulsor is a method for propelling vessels using only electric and magnetic fields with no moving parts, using magnetohydrodynamics. Principle[edit] Ship propulsion[edit] An electric current is passed through seawater in the presence of an intense magnetic field, which interacts with the magnetic field of the current through the water. The physics equation describing this propelling force is Fmag = I (L × B) where L is the vector in the direction of the current 'I' and its length is the distance the current travels, B is the magnetic field, and × denotes the cross product.
Spacecraft propulsion[edit] Fiction[edit]