PDF Publication Title:
Text from PDF Page: 194
Towards the optimal 2020 ducted turbofan Konstantinos G. Kyprianidis Some important observations can be made: • Improving fan and low pressure turbine polytropic efficiency directly im- proves SFC; the potential SFC benefits from reducing specific thrust how- ever remain largely unaffected. As fan tip pressure ratio reduces, pressure losses in the bypass duct tend to have an increasingly dominant effect on transmission efficiency and, therefore, on the impact of propulsive efficiency improvements on SFC. • Improving fan and low pressure turbine polytropic efficiency increases the optimal BPR value, at a constant specific thrust. Although not illustrated in Fig. 7.1 and Fig. 7.2, improving core specific output and component efficiency will have a similar effect. Bypass ratio can therefore be considered as a good indicator of engine technology level. • Limited SFC improvement may be envisaged by reducing specific thrust beyond a fan pressure ratio of 1.45. The increased fan diameter will result in significant engine weight and nacelle drag penalties which can very well negate the projected uninstalled SFC benefits. A larger fan, low pressure turbine and nacelle will also increase the production cost significantly. For determining the fuel optimal specific thrust and BPR levels, the effects of engine weight and nacelle drag on aircraft performance need to be considered, hence the need for the TERA2020 (Techno-economic, Environmental and Risk Assessment for 2020) tool. Block fuel benefits from reducing specific thrust for a year 2020 entry into service direct drive fan conventional core engine for long range applications have been calculated and are illustrated in Fig. 7.3. The engine take-off (T/O) thrust at ISA SLS conditions is 66000 [lbf] and all FPR and BPR values quoted are at mid-cruise conditions. A 10 [in] increase in fan diameter and a 4% reduction in FPR (which roughly translates to a 14% reduction in specific thrust) results in a 2% improvement in mid-cruise uninstalled SFC; using the exchange rates reported in Chapter 3 this would imply an improvement in block fuel of some 2.6%. Nevertheless, the engine weight has increased significantly by roughly 17% and in conjunction with the higher nacelle drag the block fuel benefit reduces to merely 0.85%. More details on the fuel optimal design proposed and the constraints set to derive it are given in Section 7.2. It is worth noting that a recent study by Hemmer et al. [236], albeit based on significantly more 154PDF Image | Multi-disciplinary conceptual design of future jet engine systems
PDF Search Title:
Multi-disciplinary conceptual design of future jet engine systemsOriginal File Name Searched:
thesis-future-jet-engines.pdfDIY PDF Search: Google It | Yahoo | Bing
NFT (Non Fungible Token): Buy our tech, design, development or system NFT and become part of our tech NFT network... More Info
IT XR Project Redstone NFT Available for Sale: NFT for high tech turbine design with one part 3D printed counter-rotating energy turbine. Be part of the future with this NFT. Can be bought and sold but only one design NFT exists. Royalties go to the developer (Infinity) to keep enhancing design and applications... More Info
Infinity Turbine IT XR Project Redstone Design: NFT for sale... NFT for high tech turbine design with one part 3D printed counter-rotating energy turbine. Includes all rights to this turbine design, including license for Fluid Handling Block I and II for the turbine assembly and housing. The NFT includes the blueprints (cad/cam), revenue streams, and all future development of the IT XR Project Redstone... More Info
Infinity Turbine ROT Radial Outflow Turbine 24 Design and Worldwide Rights: NFT for sale... NFT for the ROT 24 energy turbine. Be part of the future with this NFT. This design can be bought and sold but only one design NFT exists. You may manufacture the unit, or get the revenues from its sale from Infinity Turbine. Royalties go to the developer (Infinity) to keep enhancing design and applications... More Info
Infinity Supercritical CO2 10 Liter Extractor Design and Worldwide Rights: The Infinity Supercritical 10L CO2 extractor is for botanical oil extraction, which is rich in terpenes and can produce shelf ready full spectrum oil. With over 5 years of development, this industry leader mature extractor machine has been sold since 2015 and is part of many profitable businesses. The process can also be used for electrowinning, e-waste recycling, and lithium battery recycling, gold mining electronic wastes, precious metals. CO2 can also be used in a reverse fuel cell with nafion to make a gas-to-liquids fuel, such as methanol, ethanol and butanol or ethylene. Supercritical CO2 has also been used for treating nafion to make it more effective catalyst. This NFT is for the purchase of worldwide rights which includes the design. More Info
NFT (Non Fungible Token): Buy our tech, design, development or system NFT and become part of our tech NFT network... More Info
Infinity Turbine Products: Special for this month, any plans are $10,000 for complete Cad/Cam blueprints. License is for one build. Try before you buy a production license. May pay by Bitcoin or other Crypto. Products Page... More Info
CONTACT TEL: 608-238-6001 Email: greg@infinityturbine.com (Standard Web Page)