Author: N. J. HeideggerPublisher:
ISBN:
Category :
Languages : en
Pages : 150
Book Description
Aeropropulsion Technology (APT). Task 23 - Stator Seal Cavity Flow Investigation
Author: N. J. HeideggerAeropropulsion Technology (Apt). Task 23 - Stator Seal Cavity Flow Investigation
Author: National Aeronautics and Space Administration (NASA)Publisher: Createspace Independent Publishing Platform
ISBN: 9781722930691
Category :
Languages : en
Pages : 148
Book Description
The focus of NASA Contract NAS3-25950 Task 23 was to numerically investigate the flow through an axial compressor inner-banded stator seal cavity. The Allison/NASA developed ADPAC code was used to obtain all flow predictions. Flow through a labyrinth stator seal cavity of a high-speed compressor was modeled by coupling the cavity flow path and the main flow path of the compressor. A grid resolution study was performed to guarantee adequate grid spacing was used. Both unsteady rotor-stator-rotor interactions and steady-state isolated blade calculations were performed with and without the seal cavity present. A parameterized seal cavity study of the high-speed stator seal cavity collected a series of solutions for geometric variations. The parameter list included seal tooth gap, cavity depth, wheel speed, radial mismatch of hub flowpath, axial trench gap, hub corner treatments, and land edge treatments. Solution data presented includes radial and pitchwise distributions of flow variables and particle traces describing the flow character. Heidegger, N. J. and Hall, E. J. and Delaney, R. A. Glenn Research Center LABYRINTH SEALS; TURBOCOMPRESSORS; CAVITY FLOW; FLOW DISTRIBUTION; COMPUTATIONAL FLUID DYNAMICS; NAVIER-STOKES EQUATION; AIRCRAFT ENGINES; STATOR BLADES; GRID GENERATION (MATHEMATICS); ROTOR STATOR INTERACTIONS; RADIAL DISTRIBUTION; HUBS; PRESSURE DISTRIBUTION; VELOCITY DISTRIBUTION; PARAMETER IDENTIFICATION; PROPULSION SYSTEM PERFORMANCE...
32nd AIAA/ASME/SAE/ASEE Joint Propulsion Conference & Exhibit
Author: Follow-on Low Noise Fan Aerodynamic Study
Author: Rotordynamics of Turbomachinery
Author: John M. VancePublisher: John Wiley & Sons
ISBN: 9780471802587
Category : Technology & Engineering
Languages : en
Pages : 404
Book Description
Describes the rotordynamic considerations that are important to the successful design or troubleshooting of a turbomachine. Shows how bearing design, fluid seals, and rotor geometry affect rotordynamic behavior (vibration, shaft whirling, bearing loads, and critical speeds), and describes two successful computational methods for rotordynamic analysis in terms that can be understood by practicing engineers. Gives descriptive accounts of the state of the art in several areas of the field and presents important mathematical or computational concepts, describing equations and formulas in physical terms for better understanding. Also offers tips for troubleshooting unstable machines and provides practical interpretations of vibration measurements.
Small-Scale Energy Systems with Gas Turbines and Heat Pumps
Author: Satoru OkamotoPublisher: MDPI
ISBN: 3036500723
Category : Technology & Engineering
Languages : en
Pages : 134
Book Description
A heat pump system can produce an amount of heat energy that is greater than the amount of energy used to run the heat pump system. Thus, a heat pump system is considered to be a machine system that can use energies efficiently, as is the load leveling air-conditioning system utilizing unutilized energies at high levels. Adaptations of gas turbines for industrial, utility, and marine-propulsion applications have long been accepted as means for generating power with high efficiency and ease of maintenance. Cogeneration with gas turbine is frequently defined as the sequential production of useful thermal energy and shaft power from a single energy source. For applications that generate electricity, the power can either be used internally or supplied to the utility grid. This Special Issue intends to provide an overviews of the existing knowledge related with various aspects of “Small-Scale Energy Systems with Gas Turbines and Heat Pumps”, and contributions on, but not limited to the following subjects were encouraged: wake of stator vane to improve sealing effectiveness; gas turbine cycle with external combustion chamber for prosumer and distributed energy systems; computational simulation of gas turbine engine operating with different blends of biodiesel; experimental methodology and facility for the engine performance and emissions evaluation using jet and biodiesel blends; experimental analysis of an air heat pump for heating service; hybrid fuel cell-Brayton cycle for combined heat and power; design analysis of micro gas turbines in closed cycles. Seven papers were published in the Special Issue out of a total of 12 submitted.
Facing the Heat Barrier
Author: T.A. HeppenheimerPublisher: Courier Dover Publications
ISBN: 0486834514
Category : Technology & Engineering
Languages : en
Pages : 355
Book Description
This volume from The NASA History Series presents an overview of the science of hypersonics, the study of flight at speeds at which the physics of flows is dominated by aerodynamic heating. The survey begins during the years immediately following World War II, with the first steps in hypersonic research: the development of missile nose cones and the X-15; the earliest concepts of hypersonic propulsion; and the origin of the scramjet engine. Next, it addresses the re-entry problem, which came to the forefront during the mid-1950s, showing how work in this area supported the manned space program and contributed to the development of the orbital shuttle. Subsequent chapters explore the fading of scramjet studies and the rise of the National Aerospace Plane (NASP) program of 1985–95, which sought to lay groundwork for single-stage vehicles. The program's ultimate shortcomings — in terms of aerodynamics, propulsion, and materials — are discussed, and the book concludes with a look at hypersonics in the post-NASP era, including the development of the X-33 and X-34 launch vehicles, further uses for scramjets, and advances in fluid mechanics. Clearly, ongoing research in hypersonics has yet to reach its full potential, and readers with an interest in aeronautics and astronautics will find this book a fascinating exploration of the field's history and future.
Scientific and Technical Aerospace Reports
Author: Advances in Mechanical and Electronic Engineering
Author: David JinPublisher: Springer Science & Business Media
ISBN: 3642315070
Category : Technology & Engineering
Languages : en
Pages : 599
Book Description
This book includes the volume 1 of the proceedings of the 2012 International Conference on Mechanical and Electronic Engineering(ICMEE2012), held at June 23-24,2012 in Hefei, China. The conference provided a rare opportunity to bring together worldwide researchers who are working in the fields. This volume 1 is focusing on Mechanical Engineering and Automation as well as Vehicle Engineering and Technology.
Rotor Dynamical Instability
Author: Maurice L. Adams (Jr.)Publisher:
ISBN:
Category : Rotors
Languages : en
Pages : 116
Book Description