Download or read book A Survey of Methods for Turbojet Thrust Measurement Applicable to Flight Installation written by William A. Fleming and published by . This book was released on 1955 with total page 56 pages. Available in PDF, EPUB and Kindle. Book excerpt: Experience accumulated during the past 10 years in measuring turbojet-engine thrust in altitude facilities is summarized herein to indicate the currently best-known techniques applicable for obtaining in-flight thrust measurements. Problems that are encountered in obtaining accurate thrust measurements are illustrated, and the resultant techniques required for measurement of the net thrust of several typical types of turbojet installations are discussed. Techniques for obtaining a performance calibration of the basic engine while it is installed in an airplane are also indicated.
Download or read book A Method of Measuring Jet Thrust of Turbojet Engines in Flight Installations written by Joseph N. Sivo and published by . This book was released on 1954 with total page 19 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Experimental Results of an Investigation of Two Methods of Inflight Thrust Measurement Applicable to Afterburning Turbojet Engines with Ejectors written by Harry E. Bloomer and published by . This book was released on 1958 with total page 36 pages. Available in PDF, EPUB and Kindle. Book excerpt: An investigation was conducted in an altitude test chamber using a turbojet engine equipped with an afterburner and ejector to compare directly two techniques of determining thrust that are both applicable to flight installations. One method is the use of a swinging uncooled rake at the ejector outlet. The other method requires extensive instrumentation to measure the momentum forces of the primary and secondary systems and the force on the internal surface of the ejector nozzle. The two methods are compared on the basis of accuracy, ease of installation calibration required, and so forth. Comparisons are presented so that the reader can be guided to his own choice.
Download or read book Validation of the Gas Generator Method of Calculating Jet engine Thrust and Evaluation of XB 70 1 Airplane Engine Performance at Ground Static Conditons written by Henry H. Arnaiz and published by . This book was released on 1970 with total page 52 pages. Available in PDF, EPUB and Kindle. Book excerpt: Deficiencies in established techniques of measuring aircraft thrust in flight led to the application of the gas generator method of calculating engine thrust to the XB-70-1 airplane. A series of tests on a ground static-thrust stand [were]performed on the airplane to establish at ground static conditions the accuracy of this method, to measure the installed thrust of the YJ93-GE-3 engine, and to determine the effect of instrumentation errors and nonuniform flows at the engine compressor face on the thrust calculation. Tests with an aerodynamically choked inlet, an opened inlet-bypass system, and varying combinations of operating engines were also conducted. Results showed that the accuracy of the gas generator method was ±2 percent for the normal operation of the XB-70-1 airplane at ground static conditions and for the upper 70 percent of the engine's throttle range. They also showed that the effect of individual instrument errors on the thrust calculation was reduced because of the large number of measurements and that abnormally high inlet flow distortion affects the thrust calculation. When corrected for inlet losses, the installed thrust of the YJ93-GE-3 engine agreed favorably with the engine manufacturer's uninstalled estimated thrust for all power settings except those at the low end.--P. [i].
Download or read book An Investigation of Two Variations of the Gas Generator Method to Calculate the Thrust of the Afterburning Turbofan Engines Installed in an F 111A Airplane written by Frank W. Burcham and published by . This book was released on 1971 with total page 36 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book An Investigation Into the Pilot Rake Method of Measuring Turbo Jet Engine Thrust in Flight written by J. Stephenson and published by . This book was released on 1953 with total page 19 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book An Investigation Into the Pitot Rake Method of Measuring Turbo Jet Engine Thrust in Flight written by Aeronautical Research Council and published by . This book was released on 1954 with total page 43 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book An Investigation Into the Pitot Rake Method of Measuring Turbo Jet Engine Thrust in Flight written by J. Stephenson and published by . This book was released on 1952 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Full Flight Envelope Direct Thrust Measurement on a Supersonic Aircraft written by Timothy R. Conners and published by . This book was released on 1998 with total page 38 pages. Available in PDF, EPUB and Kindle. Book excerpt: Direct thrust measurement using strain gages offers advantages over analytically-based thrust calculation methods. For flight test applications, the direct measurement method typically uses a simpler sensor arrangement and minimal data processing compared to analytical techniques, which normally require costly engine modeling and multisensor arrangements throughout the engine. Conversely, direct thrust measurement has historically produced less than desirable accuracy because of difficulty in mounting and calibrating the strain gages and the inability to account for secondary forces that influence the thrust reading at the engine mounts. Consequently, the strain-gage technique has normally been used for simple engine arrangements and primarily in the subsonic speed range. This paper presents the results of a strain gage-based direct thrust-measurement technique developed by the NASA Dryden Flight Research Center and successfully applied to the full flight envelope of an F-15 aircraft powered by two F100-PW-229 turbofan engines. Measurements have been obtained at quasi-steady-state operating conditions at maximum nonaugmented and maximum augmented power throughout the altitude range of the vehicle and to a maximum speed of Mach 2.0, and are compared against results from two analytically-based thrust calculation methods. The strain-gage installation and calibration processes are also described.
Download or read book A Survery of Methods for Turbojet Thrust Measurement Applicable to Flight Installations written by William A. Fleming and published by . This book was released on 1955 with total page 49 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Index of NACA Technical Publications written by United States. National Advisory Committee for Aeronautics and published by . This book was released on 1956 with total page 580 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Commercial Aircraft Propulsion and Energy Systems Research written by National Academies of Sciences, Engineering, and Medicine and published by National Academies Press. This book was released on 2016-08-09 with total page 123 pages. Available in PDF, EPUB and Kindle. Book excerpt: The primary human activities that release carbon dioxide (CO2) into the atmosphere are the combustion of fossil fuels (coal, natural gas, and oil) to generate electricity, the provision of energy for transportation, and as a consequence of some industrial processes. Although aviation CO2 emissions only make up approximately 2.0 to 2.5 percent of total global annual CO2 emissions, research to reduce CO2 emissions is urgent because (1) such reductions may be legislated even as commercial air travel grows, (2) because it takes new technology a long time to propagate into and through the aviation fleet, and (3) because of the ongoing impact of global CO2 emissions. Commercial Aircraft Propulsion and Energy Systems Research develops a national research agenda for reducing CO2 emissions from commercial aviation. This report focuses on propulsion and energy technologies for reducing carbon emissions from large, commercial aircraftâ€" single-aisle and twin-aisle aircraft that carry 100 or more passengersâ€"because such aircraft account for more than 90 percent of global emissions from commercial aircraft. Moreover, while smaller aircraft also emit CO2, they make only a minor contribution to global emissions, and many technologies that reduce CO2 emissions for large aircraft also apply to smaller aircraft. As commercial aviation continues to grow in terms of revenue-passenger miles and cargo ton miles, CO2 emissions are expected to increase. To reduce the contribution of aviation to climate change, it is essential to improve the effectiveness of ongoing efforts to reduce emissions and initiate research into new approaches.
Download or read book Guide to In flight Thrust Measurement of Turbojets and Fan Engines written by Great Britain. Ministry-Industry Drag Analysis Panel. Study Group and published by . This book was released on 1979 with total page 220 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Measurement of the Installed Thrust of a Jet Engine with a Static Rig written by R.S. Trayford and published by . This book was released on 1961 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book A Method of Calibrating Airspeed Installations on Airplanes at Transonic and Supersonic Speeds by the Use of Accelerometer and Attitude angle Measurements written by Carl Kaplan and published by . This book was released on 1953 with total page 252 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Some Methods Used in Determining the Thrust of Turbojet Engines by Direct Mechanical Measuring written by William Hirschel Penn and published by . This book was released on 1960 with total page 90 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book NASA Technical Note written by and published by . This book was released on 1971 with total page 568 pages. Available in PDF, EPUB and Kindle. Book excerpt:
