Topic
Rocket
About: Rocket is a research topic. Over the lifetime, 14018 publications have been published within this topic receiving 95852 citations. The topic is also known as: rockets.
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01 Jan 1959
TL;DR: The phenomenon of combustion instability in rocket motors is an oscillatory interaction between gas flow and combustion of the propellant in such a way that pressure oscillations with frequencies of 500 to 50,000 cy/sec develop with peak-to-peak amplitudes comparable to the mean pressure as mentioned in this paper.
Abstract: The phenomenon of combustion instability in rocket motors is an oscillatory interaction between gas flow and combustion of the propellant in such a way that pressure oscillations with frequencies of 500 to 50,000 cy/sec develop with peak-to-peak amplitudes comparable to the mean pressure. A qualitative description is presented of the phenomenon; difficulties of experimental study are discussed and mechanisms of excitation and suppression of instability are described.
33 citations
TL;DR: In this article, the authors reported the first observation of concentric traveling ionospheric disturbances (CTIDs) triggered by the launch of a SpaceX Falcon 9 rocket on 17 January 2016, which showed a shock acoustic wave signature in the time rate change (time derivative) of total electron content (TEC), followed by CTIDs in the 8-15 minutes bandpass filtering of TEC.
Abstract: We report the first observation of concentric traveling ionospheric disturbances (CTIDs) triggered by the launch of a SpaceX Falcon 9 rocket on 17 January 2016. The rocket triggered ionospheric disturbances show shock acoustic wave signature in the time rate change (time derivative) of total electron content (TEC), followed by CTIDs in the 8–15 minutes bandpass filtering of TEC. The CTIDs propagated northward with phase velocity of 241–617 m/s and reached distances more than 1000 km away from the source on the rocket trajectory. The wave characteristics of CTIDs with periods of 10.5–12.7 minutes and wavelength ~200–400 km agree well with the gravity wave dispersion relation. The optimal wave source searching and gravity wave ray-tracing technique suggested that the CTIDs have multiple sources which are originated from ~38–120 km altitude before and after the ignition of the 2nd stage rocket, ~200 seconds after the rocket was launched.
33 citations
Patent•
04 Sep 1944
TL;DR: The present invention relates mainly to rocket projectiles, by which is meant projectiles whose velocity is increased after they leave the gun muzzle, by means of the thrust produced by the reaction on the air of gases discharged rearwardly from the projectile as discussed by the authors.
Abstract: The present invention relates mainly to rocket projectiles, by which is meant projectiles whose velocity is increased after they leave the gun muzzle, by means of the thrust produced by the reaction on the air of gases discharged rearwardly from the projectile, said gases being developed by...
33 citations
TL;DR: A consistent set of equations suitable for real-time computation of the approximate IIP is established and can account for drag during the ascent trajectory provided that a priori information on the ballistic properties of the launch vehicle is available.
33 citations
TL;DR: To the extent one is able to make rough estimates of velocity losses due to gravity, drag and turning, these losses can be included as modifications of the required V in Equat ion, and the corrections will be reflected in the determination of the IJLJ.
Abstract: To the extent t h a t one is able to make rough estimates of velocity losses due to gravity, drag and turning, these losses can be included as modifications of the required V in Equat ion [5], and the corrections will be reflected in the determination of the IJLJ. The resulting improvement is, of course, no bet ter than the estimates of the losses; hence this method is not a substitute for accurate calculations with a high-speed digital computer. Instead, it has proved to be a valuable auxiliary, in providing very good slide-rule designs, thereby materially
33 citations