Document 69NQeQXjp65M3v3XeNV1GQm6

Temperature Me&iurement* iul Com* bastion Efficiency In Combuotora /or Cot Turbine Engine** bf P T Ohon, Everett Bernardo, National Advisory Committee for Aeronautics. Investlgatlons of general altitude performance of combujtors for aircraft gas-turbine engines employed many thermocouples for average temperature, temperature* distribution readings and combustion efficiencies. Result* indicate that value* of eombustion efficiencies based on temperature measurements give satis* factory approximations and show effect of primary variables on efficiency. Paper discusses thermocouples, their installation, construction and measure* menta for whieh they were used. ASME /Viper No. 47-A-23. Allal-Flow Compressor* for Cos Tur bines, by A f Ponomarefl, Pettinghouse Elec Corp. Operating principles, characteristics, type* and performance factors of axial-flow compressors serve as the subject matter for this informa tive paper. The principal problem yet to be solved In making the gas turbine a competitor of highly developed steam turbines and reciprocating engines is. In the author's opinion, the design of an efficient compressor that con be manufactured at low coat. ASME Paper No. 47-4-28. Cos-Turbine Plant Combustion-Cham ber Efficiency, by A L Landen, Stanford University. A proposed set of standard definitions for efficiencies of combus tion chamber performance is advanced. Three distinct terms are applied: (1) incomplete combustion end setting fosses (2) flow friction and auxiliarydrive energy requiremenu (9) influ ence of these losses on over-all plant thermal efficiency and output. Argumenta are developed for ihermodynamie mesningfulness, ready adaptobiliiy for evaluating teat performance and eycle analysis of the test terms. ASME Paper No. 47-A-32, The Universal Optimum Power Cycle for Elastic Fluid Turbine Power Plants, by John Keitner, ME, ScD and Frederick Nettef, ME, EE. Investiga tions by the authors are used os the basis for a general theoretical heat cycle called a hexagon cycle of which the Brayton, Ericsson and Carnot cycles are special cases. The hexagon, they claim, lies between the Brayton and the Ericsson. The differenee between it and the Ericsson Is in restricting (1) -intercooling to the first part of compres sion (2) reheating to the first part of 110 (119) HOW TO OBTAIN COMPLETE TEXT Material appearing In this month's briefs eomes from ooc of these three sources: Porld Power Conference st The Uaana In Sept. Papers sre identi fied by the initials ITPC end the paper No. Supply is limited at tbe present bnt will be available in the future. American Society of Mechanical Engineers, fall meeting, Salt laike City, Utah. Sent. 14, 1947. Papers ore identified oylnlllill ASME end friper No. Available while supply aits at Ameriean Society of Mechanics! Engineers, 39 W 39lb Si, Now York. N. Y. Americon Society of AfecAenleel Engineers, annual meeting, Atlantic City, N. J. Dee 14. 1947. Papers are identified by Initials ASME and paper No. Available at same ad dress, under tame terms as above. oxponslon. Formulas are developed to determine the point between tbe Brayion and Ericsson cycles where efficiency is highest ASME Paper No. 42-A-43. Determination of Cat-Turbine Combastion-Chamber Efficiency by Chemi cal Means, by Peter Lloyd, Ministry of Supply, National Gas Turbine Establish ment, England. A gravimetric tech nique of achieving a complete chemical determination of gas-turbine exhaust serves as the calibration -bate for com bustion-chamber efficiency. The au thor feels that this technique possesses an accuracy far superior to the heatbalance one. It has the added merit of indicating nature of combustion losa, a very useful aid. Various epproxi mote methods, chemical, pbyaiochemlcal and physical can be devised for comparison against the exact, complete method. ASME Paper No. 47-4-58. HYDRAULICS Pamplng Requiremenu for Irrigation In Columbia River Batin and Central Valley Projects of the Bureau of Recla mation, by Irving L Pightman, V. S. Boreou of Reclamation. An introduction to papers to be presented on the design of pumps for the Grand Coulee pumping plant on the Columbia River and the Tracy pumping plant of the Central Valley projecta in California. This paper outlines the history, facilities of each project and 41requirements for irrigation. the 12 Grand Coulee pumps will bj rated capacity of 1600 cfa at lift of 270 fi rfhen Crand Coulee voir is at its highest level, and driven by a 65,000-hp syncbmjJ motor. The Tracy pumping pl^v being constructed near Tracy, Cilij, l will have six 767-cfs vertiesl-sbsit * uifugat pumps operating under ]ft,L head, each driven by a 22^00-bp tj$ chtonoua motor. ASAfE Paper tit47-A-II6. Hydraulic Problems In Ccnn^J With the Design of the Granby PftaSL log Plant, by Eilat B Moses, U. S. reou of Reclamation, Granby pungi^l station, located over 8000 ft above ^ level near Granby, Colo., will btnj three 200-cla vertical-shait eenlrilnp/ pumps, operating under 186-lt curia**] head and driven by GQOO-hp synchm^. ous motors. Many unusual preblesfiU arose in the dtsigo of thia plant, wkSiff' deliver* water aeross the Contineaujj Divide in Colorado. Because of 94Uj variation in suction head the paef}" are located 107 ft below ground lei' ' A design is analysed for a subtenu-j fTkavo-buiIt power and boiler plants, and major Drxvo irijmpment installations, supply all types of industry l-Y with itcam,.electricity, blast air, liquid pumping and rcltted services for the myriad requirements of modern .productioneering. This broad experience of Dravo Power and Boiler Plant [^/Specialises is reflected in the roster of American industrial i1^; organisations operating Dravo-boilt and Dravo-cquipped '} power and boiler plants/--steel producers, petroleum J.'refiam,.chemical manufacturers, food processors, auro> .ntotive parts suppliers, ship builders, synthetic textile fabricators. fa |d<wriil Executives and Consulting Engineers con- with construction or expansion of power and ean plant with a cross section based *j tbooiilleer plant facilities will find that Dravo Power Dec- the hydrostatic arch, above. Seek I shape results In a considerable taviai in concrete but Is suitable only if d*! exterior hydrostatic and earth losdt in fairly constant. Becauee of limit* t? voltage fluctuation when starting ^ pump motors, on a comparatively power system, several methods iv^lPp1jrfctnmicennt Engineers can be of real service from the /pearliest planning stage to the completion of final con- MiMction details. ^. Diavo experience and facilities are described more fully y 'in Bulletin BR-304; address Power Department, Dravo Corporation, 300 Penn Avemie, Pittsburgh Z2, Pa. I?-. ' studied of bringing tbe units up to if* ebronous speed. Final design includes a diaebarfj valve, closed when starting, and ment for depressing the water behr (Continued on page 146) dravo corporation f'tUautoH PHILADELPHIA CIEVIIAND H*W YORK y` ott io WASHINGTON WUMtNOTON .}/ SL2JWwum -- fNttnuffta* StMatIlMmDd -- rwrw ru*"at *a*n4d CCaaartfrawrtw*/*V' fWJW*1 -- nd-fbW *u**t*m >'flviEL*V &*aj "* YMlu*tl* - Brut* SrtWactim-- Pnrts - ""f* 'g??_u~ *** ShiRi, Slap** TvmcI* -- rirtwaiW lirm -- C**l Or* Bitt|t -- Cnw od -- & C* Cwhrt -- 0y* ***< n#*rt*S -- * Ao*s*Wi -- ld*od SWw Tf*MportiU*o POWER February I * Fvbnieiy 1948 (T!