Effect of Air Cooling of Turbine Disk on Power and Efficiency of Turbine from Turbo Engineering Corporation Tt13-18 Turbosupercharger


Book Description

The purpose of the Taxonomy Working Group was to develop a proposal for a common taxonomy to be used by all NASA projects in the classifying of nonconformances, anomalies, and problems. Specifically, the group developed a recommended list of data elements along with general suggestions for the development of a problem reporting system to better serve NASA's need for managing, reporting, and trending project aberrant events. The Group's recommendations are reported in this document.







Comparative Effectiveness of a Convection-type and a Radiation-type Cooling Cap on a Turbosupercharger


Book Description

An investigation was made to compare the effectiveness of two basic methods of cooling a turbosupercharger and to obtain data on the temperature level and distribution in the turbine wheel. Turbine-wheel temperatures were obtained for various conditions of cooling-air mass flow, exhaust-gas temperature, and exhaust-gas mass flow. Modified forms of the standard cooling caps were used to allow for the installation of temperature-measuring devices.




Efficiency of a Radial-flow Exhaust-gas Turbosupercharger Turbine with a 12.75-inch Tip Diameter


Book Description

An investigation has been made of the effect on the performance of a radial-flow exhaust-gas turbosupercharger turbine with a 12.75-inch tip diameter of various inlet pressures, inlet temperatures, wheel speeds, pressure ratios, and cooling-air flows. For a given blade-to-jet speed ratio, variation in pressure ratio from 1.5 to 4.0 and inlet temperature from 800 to 1200 degrees R had only a small effect on turbine efficiency. For blade-to-jet speed ratios of 0.5 to 0.6, the efficiency increased 4.5 points as inlet pressure increased from 20 to 50 inches of mercury absolute. Cooling-air flow had no measurable effect on turbine efficiency within the accuracy of the tests in the test range: namely, ratios of cooling-air flow to turbine gas flow from 0 to 14 percent, turbine pressure ratio of 2.0, turbine inlet total pressures from 15 to 40 inches of mercury absolute, and inlet temperatures from 800 to 2000 degrees R.




The Effect of Inlet Temperature and Pressure on the Efficiency of a Single-stage Impulse Turbine Having a 13.2-inch Pitch-line Diameter Wheel


Book Description

Efficiency tests have been conducted on a single-stage impulse turbine having a 13.2-inch pitch-line diameter wheel and a cast nozzle diaphragm over a range of turbine speeds from 3000 to 17,000 rpm pressure ratios from 1.5 to 5.0, inlet total temperatures from 1200 to 2000 degrees R, and inlet total pressures from 18 to 59 inches of mercury absolute. The effect of inlet temperature and pressure on turbine efficiency for constant pressure ratio and blade-to-jet speed ratio is correlated against a factor derived from the equation for Reynolds number. The degree of correlation indicates that the change in turbine efficiency with inlet temperature and pressure for constant pressure ratio and blade-to-jet speed ratio is principally a Reynolds number test.




Gas Turbine Heat Transfer and Cooling Technology, Second Edition


Book Description

A comprehensive reference for engineers and researchers, Gas Turbine Heat Transfer and Cooling Technology, Second Edition has been completely revised and updated to reflect advances in the field made during the past ten years. The second edition retains the format that made the first edition so popular and adds new information mainly based on selected published papers in the open literature. See What’s New in the Second Edition: State-of-the-art cooling technologies such as advanced turbine blade film cooling and internal cooling Modern experimental methods for gas turbine heat transfer and cooling research Advanced computational models for gas turbine heat transfer and cooling performance predictions Suggestions for future research in this critical technology The book discusses the need for turbine cooling, gas turbine heat-transfer problems, and cooling methodology and covers turbine rotor and stator heat-transfer issues, including endwall and blade tip regions under engine conditions, as well as under simulated engine conditions. It then examines turbine rotor and stator blade film cooling and discusses the unsteady high free-stream turbulence effect on simulated cascade airfoils. From here, the book explores impingement cooling, rib-turbulent cooling, pin-fin cooling, and compound and new cooling techniques. It also highlights the effect of rotation on rotor coolant passage heat transfer. Coverage of experimental methods includes heat-transfer and mass-transfer techniques, liquid crystal thermography, optical techniques, as well as flow and thermal measurement techniques. The book concludes with discussions of governing equations and turbulence models and their applications for predicting turbine blade heat transfer and film cooling, and turbine blade internal cooling.










Turbine Cooling and Aerodynamics


Book Description

Turbine Cooling and Aerodynamics examines the current state-of-the-art turbine cooling technologies and provides the reader with an understanding of the fundamental scientific issues pertinent to the cooling technology in addition to the factors relevant to the engineering design. In order to achieve greater thrust/power and greater efficiency of high turbine engines, higher turbine inlet temperatures are desired without a significant penalty on the coolant usage and aerodynamic losses.. Modern turbine engines typically operate at turbine inlet temperatures in the 2550-3000 deg F which is above the material limits of the nickel alloy airfoil materials. Therefore the airfoils used in turbine engines have to be actively cooled using a fraction (15-20%) of the process air. The use of process air for cooling represents a loss of efficiency. It is therefore desired to minimize coolant air usage and maximize turbine inlet temperatures. These conflicting requirements have resulted in a wealth of strategies for turbine cooling aimed at maximizing cooling with minimal impact on aerodynamic efficiency. The science and engineering of turbine cooling and aerodynamics is reviewed in this monograph.




Cooling of Gas Turbines


Book Description