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Wednesday, January 29, 2020 | History

2 edition of The Use of electrical discharge for ignition and control of combustion of solid propellants found in the catalog.

The Use of electrical discharge for ignition and control of combustion of solid propellants

The Use of electrical discharge for ignition and control of combustion of solid propellants

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  • 16 Currently reading

Published by National Aeronautics and Space Administration in Washington DC .
Written in English

    Subjects:
  • Solid propellants.

  • Edition Notes

    StatementTakeshi Tachibana ... [et al.].
    SeriesNASA technical memorandum -- NASA TM-88548., NASA technical memorandum -- 88548.
    ContributionsTachibana, Takeshi., United States. National Aeronautics and Space Administration.
    The Physical Object
    FormatMicroform
    Pagination1 v.
    ID Numbers
    Open LibraryOL15293229M

    A steady current flows from the battery, through the current-limiting resistor, through the primary coil, through the closed breaker points and finally back to the battery. Back pressure and optimal expansion[ edit ] For optimal performance, the pressure of the gas at the end of the nozzle should just equal the ambient pressure: if the exhaust's pressure is lower than the ambient pressure, then the vehicle will be slowed by the difference in pressure between the top of the engine and the exit; on the other hand, if the exhaust's pressure is higher, then exhaust pressure that could have been converted into thrust is not converted, and energy is wasted. The lack of moving parts compared with the mechanical system leads to greater reliability and longer service intervals. New experimental techniques, advanced diagnostics and new modeling capabilities that are applicable to the dynamic conditions inherent in detonation events are of interest to this community. Early EMS systems used an analogue computer to accomplish this, but as embedded systems dropped in price and became fast enough to keep up with the changing inputs at high revolutions, digital systems started to appear. The ignition coil consists of two transformer windings — the primary and secondary.

    The epidemiologic literature covering environmental agents and respiratory conditions has used varying definitions as knowledge has evolved. As the engine crankshaft turns, it also turns the distributor shaft at half the speed. Areas of interest include injection, mixing, analytical models of combustion and fuel regression rate, ignition system design, and simulation of combustor flows. Plugtop coil from Honda one of six Other innovations are currently available on various cars. The trembler coil would be energized at an appropriate point in the engine cycle.

    The purpose of the ignition coil is to make a spark that jumps the spark plug's gap, which might be 0. This limit can be overcome by substituting for the breaker a 'pair of breakers' aka "dual points" that are connected electrically in parallel but spaced on opposite sides of the cam so they are driven out of phase. Expansion in the rocket nozzle then further multiplies the speed, typically between 1. This allows for greater timing flexibility, and engine performance; especially when designed hand-in-hand with the engine carburetor.


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The Use of electrical discharge for ignition and control of combustion of solid propellants book

Isp in vacuum of various rockets Rocket. In this paper, the formation and transformation of the spark plasma and the mechanism of material removal during a single pulse discharge are introduced.

Asthma is marked by reversible airway obstruction and airway inflammation. Electronic ignition EI solves these problems. In all of those studies, the standardized mortality ratios SMRs were below 1. This study will relate the microstructure, mechanical properties, and thermal properties at various volume fractions of CNTs.

Results indicate that the energy density of electropulsing treatment is very concentrated because of the waveform of high peak value and short duration. That's why typical binders are rubbers, often including plasticizers, as these are less likely to crack under pressure.

In aboutBosch introduced a double-coil magneto, with a fixed sparking plug, and the contact breaker outside the cylinder. Magnetos were used in these engines because their simplicity and self-contained operation was more reliable, and because magnetos weighed less than having a battery and dynamo or alternator.

They included Australian petroleum-industry workers Christie et al. Robert J. Ultimately, the point separation will increase to something such as 0. Contributing presentations aside from those invited are welcome. Summary and Conclusion A fairly extensive literature describes results of cohort studies designed to examine mortality in workers in the petroleum industry Table 5.

This may be accomplished by a variety of design approaches including turbopumps or, in simpler engines, via sufficient tank pressure to advance fluid flow. Modern EMSs read in data from various sensors about the crankshaft position, intake manifold temperature, intake manifold pressure or intake air volumethrottle position, fuel mixture via the oxygen sensor, detonation via a knock sensor, and exhaust gas temperature sensors.

It is usually quite large. This can be achieved by all of: heating the propellant to as high a temperature as possible using a high energy fuel, containing hydrogen and carbon and sometimes metals such as aluminiumor even using nuclear energy using a low specific density gas as hydrogen rich as possible using propellants which are, or decompose to, simple molecules with few degrees of freedom to maximise translational velocity Since all of these things minimise the mass of the propellant used, and since pressure is proportional to the mass of propellant present to be accelerated as it pushes on the engine, and since from Newton's third law the pressure that acts on the engine also reciprocally acts on the propellant, it turns out that for any given engine, the speed that the propellant leaves the chamber is unaffected by the chamber pressure although the thrust is proportional.

Ignition system

It is the creation of this spark which consumes the energy that was stored in the ignition coil's magnetic field. In practice, perfect expansion is only achievable with a variable-exit area nozzle since ambient pressure decreases as altitude increasesand is not possible above a certain altitude as ambient pressure approaches zero.

Expansion in the rocket nozzle then further multiplies the speed, typically between 1.Aug 15,  · The advantages of the ShT–nanosecond discharge experiments are the following: (i) both discharge and combustion parameters are studied in a single-shot mode; (ii) discharge and combustion are separated in time, so the cross-links between the discharge excitation and the ignition can be minimized, (iii) a wide range of pressures and Cited by: Get this from a library!

The Use of electrical discharge for ignition and control of combustion of solid propellants. [Takeshi Tachibana; United States. National Aeronautics and Space Administration.;]. built for the study of diffusive ignition and combustion of low-volatility fuels • Ignition temperature of n-heptane and iso-octane was experimentally determined at pressures of ~ atm • Numerical simulation of the ignition response was conducted with detailed chemistry and transport • Three kinetic models were employed and the.

A solid rocket motor: Solid rocket. propellants are prepared as a mixture of fuel and oxidizing components called 'grain' and the propellant storage casing effectively becomes the combustion chamber. Liquid-fueled rockets typically pump separate fuel and oxidiser components into the combustion chamber, where they mix and burn.

The propellants used in amateur rocket engines require a separate source for ignition. Because the engines are small, the use of an engine-mounted spark plug is not generally feasible.

Even if it were, the ignition of incoming propellants in the combustion chamber by. low supersonic regimes offers the best use (refs. 19 and 20). V. Metallized Gelled Propellants and PDEs Adding metal particles to the combusting flow was thought to allow a higher laminar flame speed and increase the energy of the combustion process.

Experiments were planned to test this theory. Often with.