| 释义 |
▪ I. reˈheat, v.
[re- 5 a.]
trans. To heat again. Hence reˈheated ppl. a.; spec. in Aeronaut., equipped with or augmented by afterburning. Cf. reheat n. 1 b.
1727[see reheating vbl. n.]. 1839Ure Dict. Arts 573 In making bottles we should..reheat them as seldom as may be absolutely necessary. 1884W. H. Greenwood Steel & Iron xvi. 357 They are now only very rarely employed for reheating steel ingots. 1886Century Mag. Oct. 941 Our breakfast of reheated coffee and stale bread. 1961F. K. Mason Hawker Aircraft since 1920 74 Work started on a development using a fifty degree swept wing and a re-heated Avon of greatly increased power. 1976Farnborough International Exhibition (Official Programme) 43/1 With a reheated take-off thrust of 38,000 lbs., this engine entered airline service in Concorde.
Add:b. intr. for pass. Of food: to undergo reheating (well or badly).
1974Times 23 Nov. 13/2 The following recipe reheats very well and can be made in advance. Ibid. 21 Dec. 9/5 Red cabbage..reheats well. 1980Washington Post 27 Mar. e1/2 Kedgeree also reheats well, so..last night's supper can become next morning's good breakfast. 1989Chicago Tribune 7 May xx. 7/3 Lachman advises against taking home onion rings and french fries. They won't reheat well, she said.
▪ II. reheat, n.|ˈriːhiːt|
[f. the vb.]
1. a. The action or an instance of reheating; spec. artificial or spontaneous heating of the working fluid in a turbine taking place between stages. Also attrib.
1913[see reheat factor below]. 1918Engineering 6 Sept. 245/1 The case of a turbine consisting of two equal stages which, in order to avoid complications due to ‘reheat’, will be assumed to be operated by water. 1938Van Nostrand's Sci. Encycl. 950/1 Many industrial processes in which heat plays a part, employ reheating, sometimes to the extent of several ‘reheats’. 1953Jennings & Rogers Gas Turbine Analysis & Practice iii. 104 One of the factors contributing to this lower efficiency is the..deleterious effect of reheat in the compressor. 1959Motor 27 May 562/3 The resultant gases pass through the high-speed turbine, then a second, ‘re-heat’ combustion chamber followed by the power turbine. 1965Economist 17 Apr. 326/1 The main items needed..are another reheat furnace for the slabbing mill and a cold reduction line. 1966McGraw-Hill Encycl. Sci. & Technol. XI. 425/2 Under suitable conditions of initially high steam pressure and superheat, one or two stages of reheat can be advantageously employed to improve thermodynamic efficiency of the cycle. 1975J. B. Woodward Marine Gas Turbines ii. 44 The reheat step consists of a constant⁓pressure heating interposed between two expansion processes.
b. Aeronaut. = after-burning vbl. n. 2. Also, an afterburner.
1949[see after-burning vbl. n. 2]. 1950Engineering 6 Oct. 295/1 The performance of a jet engine may be changed by ‘reheat’ i.e., the burning of additional fuel with residual oxygen remaining in the combustion gases after they have passed through the turbine. 1957Ann. Reg. 1956 i. 14 The hero of the occasion was Mr. L. P. Twiss flying a Fairey Delta 2 research aircraft, powered by a Rolls Royce Avon turbo-jet fitted with reheat. 1959Spectator 4 Sept. 295/1 A fighter making a 700 mile-an-hour run a few feet from the spectators, with re-heat ablaze, used to be a grand spectacle. 1972D. Hart-Davis Spider in Morning ii. 21 The reheats were in and burning fuel at a terrifying rate. 1976Farnborough Internat. Exhibition (Official Programme) 11/2 Such is the engines' thrust when reheat is on that fuel is burnt up at an incredible 20 tons an hour.
2. Special Comb.: reheat factor, a measure of the performance of a multistage steam turbine, usu. expressed as the ratio of the measured efficiency of the turbine and the (lower) efficiency expected on the assumption of adiabatic expansion of the steam.
1913H. M. Martin Design & Constr. of Steam Turbines v. 44 It will be noted that after an expansion of one hundred⁓fold or so, the ratio ε/η becomes practically constant. This ratio..is known as the ‘reheat factor’. 1950J. K. Salisbury Steam Turbines & their Cycles i. 34 The sum of the stage available energies is greater than the turbine available energy by a small amount. The ratio of these two quantities is..the reheat factor. 1961Fox & McBirnie Marine Steam Engines & Turbines (ed. 2) xviii. 438 The significance of the reheat factor is that in a multi-stage steam turbine any particular stage benefits somewhat from the inefficiency of the preceding stages. |