PDF Publication Title:
Text from PDF Page: 013
Axial-Flow Compressors The term axial flow applies to the axial (straight-line) flow of air through the compressor section of the engine. The axial-flow compressor has two main elements—a rotor and a stator. Each consecutive pair of rotor and stator blades makes a pressure stage. The rotor is a shaft with blades attached to it. These blades impel air rearward in the same manner as a propeller, by reason of their angle and airfoil contour. The rotor, turning at high speed, takes in air at the compressor inlet and impels it through a series of stages. The action of the rotor increases the compression of the air. At each stage it accelerates rearward. The stator blades act as diffusers, partially converting high velocity to pressure. Maintaining high efficiency requires small changes in the rate of diffusion at each stage. The number of stages depends on the amount of air and total pressure rise required. A greater number of stages means a higher compression ratio. Most present day engines use from 10 to 16 stages. An axial-flow compressor follows the same rules and has the same limitations as an aircraft wing. The concept is more complicated than a single airfoil, because the blades are close together. Each trailing edge blade affects the next leading edge. This cascade effect is of prime importance in determining blade design and placement. The axial-flow compressor has its disadvantages, the most important of which is the stall problem. If, for some reason, the angle of attack—the angle at which the airflow strikes the rotor blades—becomes too low, the pressure zones, shown in Figure 1-19, will be of low value, and the airflow and compression will be low. If the angle of attack is high, the pressure zones will be high, and the airflow and compression ratio will be high. If the angle of attack is too high, the compressor will stall. Figure 1-19 — The cascade effect. Figure 1-18 — Centrifugal-flow engine. The airflow over the upper foil surface will become turbulent and destroy the pressure zones. This will decrease the compression airflow. The angle of attack will vary with engine rpm, compressor-inlet temperature, and compressor discharge or burner pressure. Any action that decreases airflow relative to engine speed will increase the angle of attack and increase the tendency to stall. The decrease in airflow may result from a too-high compressor-discharge pressure. During ground operation of the engine, the prime action that causes a stall is choking. If there is a decrease in the engine speed, the compression ratio will decrease with the lower rotor velocities. With a decrease in compression, the volume of air in the rear of the compressor will be greater. This excess volume of air causes a choking action in the rear of the compressor with a decrease in airflow. This, in turn, decreases the air velocity in the front of the compressor and increases the tendency to stall. If no corrective action is taken, the front of the compressor will stall at low engine speeds. 1-13PDF Image | JET ENGINE THEORY AND DESIGN
PDF Search Title:
JET ENGINE THEORY AND DESIGNOriginal File Name Searched:
14008A_ch1.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)