Knock is the result of the rapid combustion of the end-gas ahead of the flame front which undergoes chemical reactions prior to normal combustion. This cause high frequency pressure oscillations inside the cylinder that produce the sharp metallic noise called knock.

Two theories have been postulated to explain the origin of knock :

1. The autoignition theory which states that when the air/fuel mixture in the end- gas region is compressed to sufficiently high pressure and temperature the fuel oxidation process - starting with the preflame chem ....etc

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1. INTRODUCTION
Rocket engines that work much like an automobile engine are being developed at NASA s Marshall Space Flight Center in Huntsville, Ala. Pulse detonation rocket engines offer a lightweight, low-cost alternative for space transportation. Pulse detonation rocket engine technology is being developed for upper stages that boost satellites to higher orbits. The advanced propulsion technology could also be used for lunar and planetary Landers and excursion vehicles that require throttle contr ....etc

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Pulse Detonation Engine



1 Introduction
1.1 General
This project investigated the ability to split and utilize a propagating detonation wave as both an ignition source and a thrust producer. The resulting hardware could be directly employed in ignition system design. The research is aimed toward practical application, and therefore investigates using commercially available components rather than design optimization. Though system level effects were addressed in this work, the ....etc

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PULSE DETONATION ENGINE TECHNOLOGY: AN OVERVIEW


Introduction
Imagine aircraft crossing continents and oceans at higher speeds and efficiencies.
Imagine spacecraft launching with higher safety factors and lower costs. Imagine
military craft operating in many flight conditions with increased performance. This is the
potential for Pulse Detonation Engine (PDE) technology; it has the capability to
revolutionize the aviation industry.

Description of Pulse Detonation Technolog ....etc

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