Steam turbines; a practical and theoretical treatise for engineers and students, including a discussion of the gas turbine . ne and that required to drive * Turnspit is the name usually applied to the dog which was used to turn, bymeans of a suitable mechanical contrivance, a spit or long iron bar, pointed at oneend, used to hang up meat to be roasted. 434 THE STEAM TURBINE the turbine-compressor. A turbine designed to develop 260horsepower has been constructed on this plan, but it has notbeen commercially developed. It is very doubtful, if all otherdifficulties were overcome, whether this met
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Steam turbines; a practical and theoretical treatise for engineers and students, including a discussion of the gas turbine . ne and that required to drive * Turnspit is the name usually applied to the dog which was used to turn, bymeans of a suitable mechanical contrivance, a spit or long iron bar, pointed at oneend, used to hang up meat to be roasted. 434 THE STEAM TURBINE the turbine-compressor. A turbine designed to develop 260horsepower has been constructed on this plan, but it has notbeen commercially developed. It is very doubtful, if all otherdifficulties were overcome, whether this method of air injectioncould give nearly as good economy as water injection. (Seepage 436.) Some attention has been given to the development of theexplosion gas turbine, of which a very simple form is shown inFig. 219. It consists of a combustion chamber E, of which oneend is closed by a large valve A opening inward, admitting airthrough the parts B, B and fuel through tubes F, F opening intothe valve seat. The mixture of gas and air is ignited by electricsparks at I, and the products of combustion are discharged from rtW. Fig. 219. A Simple Explosion Gas Turbine. the chamber through a small opening J leading into the nozzle N, where air, as shown by the arrows, is mixed with the gases toreduce their temperature before they reach the blades of theturbine wheel W opposite the nozzle. It is a well-established fact that when a mixture of gas and airis exploded there is first a sudden expansion and then, becauseof the combination of the hydrogen in the burned gases withthe oxygen in the excess air to form water, a vacuum is produced.This phenomenon is applied in this apparatus to operate thevalve A, which by the formation of a vacuum is drawn inwardto admit another charge of gas and air. It is stated that insuch a turbine the explosions will occur very rapidly — from 3500to 5000 per minute — so that there is a practically continuousdischarge upon the wheel. The efficiency of an exp