An introduction to structural theory and design theory: By Hale Sutherland, A.B., S.B., M. Am. Soc. C. E., Professor of Civil Engineering, Lehigh University, and Harry Lake Bowman, S.M., M. Am. Soc. C. E., Professor of Civil Engineering, Drexel Institute. ix–318 pages, 8vo, cloth. New York, John Wileys & Sons, Inc., 1930. Price $3.50
✍ Scribed by L.E.P.
- Publisher
- Elsevier Science
- Year
- 1931
- Tongue
- English
- Weight
- 129 KB
- Volume
- 211
- Category
- Article
- ISSN
- 0016-0032
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✦ Synopsis
of molecular transformation within the zone was found in all cases to be proportional to pressure, that the transformation within the zone is the result of binary impacts. This result is of unusual interest in the case of the reaction of heavy hydrocarbon fuels and the reaction mechanism proposed by the recent kinetic theory of Chain Reactions.
Report No. 373. Coefficients of Discharge of Fuel Injection Nozzles for Compression-Ignition Engines--by A. G. Gelalles, I9 pages, illustrations, quarto, Washington, Government Printing Office, I93I, price ten cents. This report presents the results of an investigation to determine the coefficients of discharge of nozzles with small, round orifices of the sizes used with high speed compression-ignition engines. The iniection pressures and chamber back pressures employed were comparable to those existing in compression-ignition engines during injection. The construction of the nozzles was varied to determine the effect of the nozzle design on the coefficient. Tests were also made with the nozzles assembled in an automatic injection valve, both with a plain and with a helically grooved stem.
It was found that a smooth passage before the orifice is requisite for high flow efficiency. A beveled leading edge before the orifice gave a higher coefficient of discharge than a rounded edge. Varying the length-diameter ratio from I to 3 for one of the orifices having a beveled leading edge was found to have no effect on the value of the coefficient. The results with the nozzles assembled in an automatic injection valve having a plain stem duplicated those with the nozzles assembled at the end of a straight tube of constant diameter. Lower coefficients were obtained with the nozzles assembled in an injection valve having a helically grooved stem.
When the coefficients of nozzles of any one geometrical shape were plotted against values of corresponding Reynolds Numbers for the orifice diameters and rates of flow tested, it was found that experimental points were distributed along a single curve.