shock stall
Language: English
Part of speech: noun
Pronunciation: ipa: /ˈʃɒk ˌstɔːl/
ipa: /ˈʃɑk ˌstɔl/
Forms: form: shock stalls
form: shockstall
form: shock-stall
Etymology: The noun is derived from shock + stall (“loss of lift due to an airfoil’s critical angle of attack being exceeded”). The verb is derived from the noun.
Senses: examples: text: When I was down to 32,000 feet the altimeter was spinning merrily and the dive was very steep and I was pulling back on the stick in the usual way due to the change of trim at the shock stall.
ref: 1944 April 27, Peter Caygill, quoting Tony Martindale, “Problems with Compressibility”, in Sound Barrier: The Rocky Road to MACH 1.0+, Barnsley, South Yorkshire: Pen & Sword Aviation, Pen & Sword Books, published 2006, →ISBN, page 41:
text: His [Group Captain Hugh Joseph Wilson's] flights revealed at least two things: the effectiveness of turbojets used for the first time in international record breaking, and he came sufficiently close to the speed of sound to experience the effects of a partial shock stall. [...] It was noticed that changes in the air flow occur when the speed approaches the speed of sound—or, in other words, the speed at which waves propagate themselves in air—and that these changes could lead to a partial or complete shock stall.
ref: 1947 August, Oliver Stewart, “Breaking the World’s Speed Record”, in Max Karant, editor, Flying, volume 41, number 2, Chicago, Ill.: Ziff-Davis Publishing Company, →ISSN, →OCLC, page 60, column 1:
text: A new realm in aerodynamics is entered, with sound and shock waves, Mach number and compressibility making their appearance. Life saving dope is disseminated [during ground training] on the warning signals and recognition of shock stalls and measures in recovering from them.
ref: 1949 December, “Jetterbugs Made: Not Born to the Trade”, in Arthur L. Schoeni, editor, Naval Aviation News, number 332, Washington, D.C.: Chief of Naval Operations and Bureau of Aeronautics, →ISSN, →OCLC, page 2, column 2:
text: Direct evidence is meagre, but suggests that local shockstalls of this type do not generally imply a severe increase of drag, but may occasionally set up buffeting effects.
ref: 1956, A. S. Hartshorn, L. F. Nicholson, The Aerodynamics of the Cooling of Aircraft Reciprocating Engines (Reports and Memoranda; 2498), London: Her Majesty’s Stationery Office, →OCLC, page 37:
text: Compressibility effects are not found to change the dynamic stall characteristics in principle until the Mach number gets high enough to cause shock-stall rather than leading edge stall.
ref: 1968, Lars E. Ericsson, J. Peter Reding, Unsteady Airfoil Stall and Stall Flutter (NASA Contractor Report; NASA/CR-111906), Washington, D.C.: National Aeronautics and Space Administration, →OCLC, page 34:
text: In the present work, the shock stall of an oscillating NACA64A010 airfoil for which detailed experimental data are available is studied.
ref: 2001, Paola Cinnella, “Numerical Study of Transonic Shock/Boundary Layer Interactions on an Oscillating Airfoil Using a Third-order Scheme and Nonlinear Turbulence Models”, in Nobuyuki Satofuka, editor, Computational Fluid Dynamics 2000: Proceedings of the First International Conference on Computational Fluid Dynamics, ICCFD, Kyoto, Japan, 10–14 July 2000, Berlin; Heidelberg: Springer-Verlag, →DOI, →ISBN, part V (Compressible Flows), section 1 (Introduction), page 157:
text: Anyone on the instructor's course should be experienced enough to handle the odd shock stall, which by definition was only going to happen at height where there was plenty of room to sort things out.
ref: 2010, Tony Doyle, “To Valley on the Gnat”, in Flying at the Edge: 20 Years of Front-line and Display Flying in the Cold War Era, Barnsley, South Yorkshire: Pen & Sword Aviation, Pen & Sword Books, →ISBN, part 2 (The Crest of the Wave), page 159:
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glosses: A stall (“sudden loss of lift”) caused when the airflow over an aircraft's wings is disturbed by shock waves that occurs at a specific Mach number when the aircraft is accelerating to transonic speeds.