Scientific American Monthly Volume 3

Scientific American Monthly Volume 3

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This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1921 edition. Excerpt: ...the foundation of which the structure of economic design of an engine has to be raised. Had we had this information a highly economic Diesel engine could have been designed long ago and have done away with the compressor. From this the author proceeds to the discussion of various attempts to build a Diesel engine without a compressor, such as have been proposed by Vickers, Price and Steinbecker engines. ECONOMY OF OPERATION In the determination of the economy of operation the questions as to the use of a 4-stroke and 2-stroke cycle, high or medium pressure, are questions which lie at the foundation of the problem. After discussing briefly the relative position of the 4-and 2-stroke cycles and the question of scavenging, the author proceeds to the question of compression and asks whether we shall continue to operate Diesel engines with a compression of 35 atoms. and the heavy weight of the engine and mechanical difliculties which it involves. The higher thermal efficiency secured with this compression does not have decisive value in the author's eyes, as motors employing lower compression pressures would have a lower first cost, be more reliable and show a better mechanical efficiency. As regards the advantage secured through self-ignition of the mixture, it is pointed out that the point of self-ignition goes down very materially when the cooling produced by the expanding stream of the air of injection is eliminated. With solid injection every' condition of engine operation can be met without external means of ignition at a pressure of 25 atmos., but even assuming that self-ignition would have to be dispensed with: Why not? The high value placed on the ability of the engine to operate on a basis of Self-ignition is a survival of a...
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Product details

  • Paperback | 562 pages
  • 189 x 246 x 29mm | 989g
  • United States
  • English
  • black & white illustrations
  • 123689233X
  • 9781236892331