Publication

A shadow-mask evaporated pyroMEMS igniter

Nico de Rooij
2011
Conference Papers

Abstract

A reliable pyroMEMS igniter was successfully demonstrated based on shadow-mask evaporation of metal directly onto solid propellant drops. In this way, intimate contact between the fuel and the igniter was guaranteed. No visible degradation of the fuel was observed after the evaporation. A preliminary process-parameter study was carried out. Two different ignition regimes were observed depending on the input power and igniter thickness: Joule heating and spark-induced ignition. Steady combustion in air was obtained and ignition delay time variability of less than 1 ms (std. dev.) was achieved. The igniter described herein potentially enables the wafer-level fabrication of pyroMEMS devices without any manual post-processing, thus increasing fabrication yield and device reliability.

Official source

https://infoscience.epfl.ch/entities/publication/122c8b12-d3fe-4538-88ab-efee8b003257

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Nico de Rooij
2011
Conference Papers

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/122c8b12-d3fe-4538-88ab-efee8b003257

About this result

Related concepts (32)

Propellant

A propellant (or propellent) is a mass that is expelled or expanded in such a way as to create a thrust or another motive force in accordance with Newton's third law of motion, and "propel" a vehicle, projectile, or fluid payload. In vehicles, the engine that expels the propellant is called a reaction engine. Although technically a propellant is the reaction mass used to create thrust, the term "propellant" is often used to describe a substance which contains both the reaction mass and the fuel that holds the energy used to accelerate the reaction mass.

Rocket engine

A rocket engine uses stored rocket propellants as the reaction mass for forming a high-speed propulsive jet of fluid, usually high-temperature gas. Rocket engines are reaction engines, producing thrust by ejecting mass rearward, in accordance with Newton's third law. Most rocket engines use the combustion of reactive chemicals to supply the necessary energy, but non-combusting forms such as cold gas thrusters and nuclear thermal rockets also exist. Vehicles propelled by rocket engines are commonly called rockets.

Rocket propellant

Rocket propellant is the reaction mass of a rocket. This reaction mass is ejected at the highest achievable velocity from a rocket engine to produce thrust. The energy required can either come from the propellants themselves, as with a chemical rocket, or from an external source, as with ion engines. Rockets create thrust by expelling mass rear-ward, at high velocity. The thrust produced can be calculated by multiplying the mass flow rate of the propellants by their exhaust velocity relative to the rocket (specific impulse).

Related publications (1)

A shadow-mask evaporated pyroMEMS igniter

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