Performance of solid fuel ramjet guided projectile for USN 5"/54 gun system
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Authors
Amichai, Oded
Subjects
guided projectiles
precision guided munitions
guns
gun launched ramjet, soldi fuel ramjets
antiship missile defense.
precision guided munitions
guns
gun launched ramjet, soldi fuel ramjets
antiship missile defense.
Advisors
Date of Issue
1982-03
Date
1982-03
Publisher
Monterey, California. Naval Postgraduate School
Language
en_US
Abstract
This report covers work done on performance analysis of a 5 inch, 54
caliber gun-launched guided projectile with solid fuel ramjet (SFRJ).
A computer program (TRAJET) was developed. The program contains ramjet
and trajectory analysis. The ramjet part considers conical shock wave losses, -
inlet boundary layer losses, normal shock losses, subsonic diffuser recovery,
expansion into combustor losses, heat losses at the combustor and nozzle losses
A flat earth trajectory with drag and thrust was donsidered. The various drag coefficients which were considered are: cowl drag coefficient, skin drag
coefficient, wing (or fin) wave drag coefficient and wing (or fin) friction
drag coefficient. Base drag is assumed to be zero due to the jet from ramjet
nozzle.
It was found that the cowl drag coefficient has a major influence on the
results. Therefore, a separate program (AERO) was developed to calculate this
parameter.
The 5"/54 solid fuel ramjet has a capability to produce fuel specific
impulse in the order of 400 - 900 sec. depending mostly on the flight altitude,
The thrust coefficient varies in the range of 0.3 ± 0.1 depending on the
internal areas.
A range in the order of 50 miles can be achieved with the ramjet
operation compared to only 13 miles achieved by the conventional projectile.
At low-altitude launch, a range of over 18 ronles can be reached in Air-Defense
Scenario. The ramjet propelled projectile reaches the ranges mentioned above
at high Mach numbers (Mg >. 1.8). It is, therefore, clear that the ramjet
concept provides significant improvement and has an Anti-Ship Missile
Defense (ASMD) capability.
Type
Technical Report
Description
Series/Report No
Department
Identifiers
NPS Report Number
NPS67-82-002CR
Sponsors
The work reported herein was carried out for the Naval Postgraduate
School by Oded Amichai under Contract Number N00228-81 -C-H231 .
Funder
N00228-81-C-H231
Format
Citation
Distribution Statement
Rights
This publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States.