Jump to content

Bristol Siddeley Gamma: Difference between revisions

From Wikipedia, the free encyclopedia
Browse history interactively
← Previous editNext edit →
Content deleted Content added
VisualWikitext
removed Category:Rocket engines using HotCatRemoving Parent Category.
Line 146: Line 146:
[[Category:Bristol Siddeley aircraft engines|Gamma]]
[[Category:Bristol Siddeley aircraft engines|Gamma]]
[[Category:Rocket engines using kerosene propellant]]
[[Category:Rocket engines using kerosene propellant]]
[[Category:Rocket engines using the staged combustion cycle]]


[[gl:Gamma 8]]
[[gl:Gamma 8]]

Revision as of 16:21, 22 September 2016

Gamma 201
Country of originBritain
ManufacturerBristol Siddeley
Application1st stage booster
PredecessorArmstrong Siddeley Stentor
SuccessorGamma 301
Liquid-fuel engine
PropellantHydrogen peroxide / kerosene
Mixture ratio8:1 (approx.)
Configuration
Chamber4, gimballed in opposed pairs
Gamma 301
Black Knight tail showing engines
Application1st stage booster
PredecessorGamma 201
SuccessorGamma 8
Liquid-fuel engine
PropellantHydrogen peroxide / kerosene
Mixture ratio8:1 (approx.)
Configuration
Chamber4, gimballed in opposed pairs
Performance
Specific impulse250 seconds (2.5 km/s)
Burn time120 seconds
Gamma 2
Gamma 2 rocket engine, used for the second stage
Application2nd stage
PredecessorGamma 301
SuccessorLarch (rocket engine)
Liquid-fuel engine
PropellantHydrogen peroxide / kerosene
Configuration
Chamber2, extended
Performance
Thrust, at altitude0.68 tonnes[1]
Burn time110–120 seconds
Gamma 8
Gamma 8 rocket engine on Black Arrow 1st stage
Application1st stage booster
PredecessorGamma 301
Liquid-fuel engine
PropellantHydrogen peroxide / kerosene
Configuration
Chamber8, gimballed in pairs
Performance
Burn time125 seconds

The Armstrong Siddeley, later Bristol Siddeley Gamma was a family of rocket engines used in British rocketry, including the Black Knight and Black Arrow launch vehicles. They burned kerosene fuel and hydrogen peroxide. Their construction was based on a common combustion chamber design, used either singly or in clusters of up to eight.

They were developed by Armstrong-Siddeley in Coventry, which later became Bristol Siddeley in 1959, and finally Rolls-Royce in 1966.[2]

Engine static testing was carried out at High Down Rocket Test Site, near The Needles on the Isle of Wight (50°39′38.90″N 1°34′38.25″W / 50.6608056°N 1.5772917°W / 50.6608056; -1.5772917).[3][4] (Spadeadam in Cumbria wasn't used for testing until Blue Streak, after Gamma).

Advantages of kerosene / peroxide engines

Use of kerosene / hydrogen peroxide engines has been a particularly British trait in rocket development, there being few comparable engines (such as the LR-40) from the USA.[5]

The combustion of kerosene with hydrogen peroxide is given by the formula

CH2 + 3H2O2 → CO2 + 4H2O

where CH2 is the approximate formula of kerosene (see RP-1 for a discussion of kerosene rocket fuels). This compares with the combustion of kerosene and liquid oxygen (LOX)

CH2 + 1.5O2 → CO2 + H2O

showing that the exhaust from kerosene / peroxide is predominantly water. This results in a very clean exhaust (second only to cryogenic LO2/LH2) and a distinctive clear flame.[6] The low molecular mass of water also helps to increase rocket thrust performance.[7]

The oxidiser used with Gamma was 85% high-test peroxide (HTP), H2O2. Gamma used a silver-plated on nickel-gauze catalyst to first decompose the peroxide.[8] For higher concentrations of H2O2 another catalyst would have been required, such as platinum. No ignition source was required since the very hot decomposed H2O2 is hypergolic (will spontaneously combust) with kerosene. Due to the high ratio (8:1) of the mass of H2O2 used compared to the kerosene, and also its superior heat characteristics, the H2O2 may also be used to regeneratively cool the engine nozzle before combustion. Any pre-combustion chamber used to power the pump turbines needs only to decompose H2O2 to provide the energy. This gives the efficiency advantages of closed cycle operation, without its usual major engineering problems.

All of these characteristics lead to kerosene / hydrogen peroxide engines being simpler and more reliable to construct than other liquid propellant chemistries. Gamma had a remarkably reliable service record for a rocket engine. Of the 22 Black Knight and 4 Black Arrow launchers, involving 128 Gamma engines, there were no engine failures.[7]

Stentor

The Gamma began as the smaller cruise chamber of the two-chamber Stentor rocket engine produced by Armstrong-Siddeley for the Blue Steel stand-off missile.[9]

Gamma 201

Bristol-Siddeley developed this stand-alone four-chamber engine from 1955 to 1957 for the Black Knight test vehicles.[10] Gamma 201 was used for the first twelve Black Knight launches (14 in total), Gamma 301 for most of the later flights.[11]

The initial Black Knight vehicles were single-stage rockets designed to test prototype re-entry heads for the proposed Blue Streak strategic ballistic missile. Testing of the Black Knight began at Woomera, Australia in 1958, but the Blue Streak project was cancelled in 1960. The rockets continued to be tested until 1965, as part of a planned two-stage space launcher, using the Gamma 201 for the first stage until August 1962, when it was replaced by the more powerful Gamma 301.[12][13][14][15][16][16][17][18][19][20][21]

Gamma 301

This was basically the same as the Gamma 201, but had automatic mixture-ratio control for improved thrust.[22] There were nine initial test firings of the Gamma 301 engine at High Down from 16 April to 31 May 1957, all of which were largely successful. Black Knight launches BK16 and BK18 used the Gamma 301. These two were the beginning of the Project Dazzle high-speed re-entry vehicle trials, where a solid fuel Cuckoo was mounted pointing downwards in the second stage, so as to increase re-entry speeds. Eight Gamma 301 launches were made in total.[11]

Gamma 2 / Double Gamma

A two chamber version of Gamma, used for the second stage of the Black Arrow satellite launch vehicle. As the only Gamma not required to operate at sea level, the nozzles were extended to allow better expansion.[13][23]

Gamma 8

This was an 8 chamber development of Gamma, used for the first stage of the Black Arrow satellite launch vehicle. Gamma thrust chambers were mounted in pairs radially, each pair on a one-axis tangential gimbal. Collective movement gave roll control, differential movement pitch.[23]

Bristol Siddeley Gamma rocket engines
  • Gamma 201 engine behind a Black Knight re-entry vehicle
    Gamma 201 engine behind a Black Knight re-entry vehicle
  • A rocket engine on display
    Gamma 2 rocket engine, used on the Black Arrow 2nd stage
  • The recovered remains of Stage 1 of the Black Arrow R3 rocket, successfully launched from the Woomera Rocket Range in October 1971.
    The recovered remains of Stage 1 of the Black Arrow R3 rocket, successfully launched from the Woomera Rocket Range in October 1971.

References

Wikimedia Commons has media related to Bristol Siddeley Gamma.
  1. ^ a b Black Arrow exhibit, Science Museum, London
  2. ^ "Rolls-Royce Heritage: Coventry".
  3. ^ "High Down testing site".
  4. ^ Black Knight Testing at The Needles
  5. ^ Hydrogen Peroxide – Optimal For Turbomachinery and Power Applications (pdf). 43rd IAA/ASME/SAE/ASEE Joint Propulsion Conference & Exhibit. Cincinnati, OH: American Institute of Aeronautics and Astronautics, Inc. July 2007.
  6. ^ "Black Arrow". Nicholas Hill., The "levitation" picture, showing the R3 / Prospero launch lifting off on Gamma's invisibly transparent exhaust plume.
  7. ^ a b Pietrobon, Steven S. (May–June 1999). "High Density Liquid Rocket Boosters for the Space Shuttle" (pdf). J. British Interplanetary Society. 52: 163–168, .{{cite journal}}: CS1 maint: extra punctuation (link)
  8. ^ D. Andrews; H. Sunley (July 1990). "The Gamma rocket engines for Black Knight". J. British Interplanetary Society. 43: 301–310. {{cite journal}}: Unknown parameter |lastauthoramp= ignored (|name-list-style= suggested) (help)
  9. ^ "Avro Blue Steel stand-off missile".
  10. ^ C.N. Hill (2001). A Vertical Empire: The History of the UK Rocket and Space Programme, 1950–1971. Imperial College Press. ISBN 1-86094-268-7.
  11. ^ a b "Black Knight Flight Data".
  12. ^ "Gamma 201 rocket engine, c. 1957". Science Museum.
  13. ^ a b "Gamma rocket motor".
  14. ^ Harlow, John (1993). Alpha, Beta and RTV-1, The Development of Early British Liquid Propellant Rocket Engines. Congress of the International Astronautical Federation (IAA). Graz, Austria.
  15. ^ Harlow, John (November 1999). Hydrogen Peroxide Engines – Early Work on Thermal Ignition at Westcott. International Hydrogen Peroxide Propulsion Conference, Purdue University,. pp. 211–219.{{cite conference}}: CS1 maint: extra punctuation (link)
  16. ^ a b Andrews, D.; Sunley, H. (July 1990). "The Gamma Rocket Engines for Black Knight". J. British Interplanetary Society. 43 (7). London: 301–310. Cite error: The named reference "J BIPS 43_7" was defined multiple times with different content (see the help page).
  17. ^ Harlow, John (20–24 July 1998). Hydrogen Peroxide – A U.K. Perspective. University of Surrey Symposium on Hydrogen Peroxide.
  18. ^ Robinson, H. G. R. (July 1990). "Overview of the Black Knight Project: Black Knight, its Genesis". J. British Interplanetary Society. 43 (7). London: 291–296.
  19. ^ Scragg, J. (July 1990). "A Contractor's View of the Black Knight Programme". J. British Interplanetary Society. 43 (7). London: 297–300.
  20. ^ Harlow, J. (July 1990), "Black Knight Upper Stages", J. British Interplanetary Society, Vol. 43, No. 7, London: 311–316 {{citation}}: |volume= has extra text (help)
  21. ^ Robinson, H. G. R. (July 1990), "Suggested Developments of Black Knight", J. British Interplanetary Society, Vol. 43, No. 7, London: 317–318 {{citation}}: |volume= has extra text (help)
  22. ^ H.W.B. Gordon B.A.; L.W. Parkin MSc (February 1964). A Summary of "Black Knight" Flight Data from 1958 to 1962. UK gov. Original may be found in the Public Record Office, Kew (part of AVIA 6 17362), the on-web link is to a precis by Nicholas Hill. {{cite book}}: Unknown parameter |lastauthoramp= ignored (|name-list-style= suggested) (help)
  23. ^ a b Douglas Millard (2001). Black Arrow rocket: A History of a Satellite Launch Vehicle and its Engines. London: Science Museum. ISBN 1-900747-41-3.

Retrieved from "https://en.wikipedia.org/w/index.php?title=Bristol_Siddeley_Gamma&oldid=740682955"