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194 pages

Discrete-frequency and Broadband Noise Radiation from Diesel Engine Cooling Fans


The fan may thus be operated alone during acoustic tests, independent of any masking noise sources such as the engine ... 2-10: A-weighted One third Octave Band Sound Power Spectra due to the engine cooling fan operating at 1600 RPM, ...

Publisher: ProQuest

About this book
This effort focuses on measuring and predicting the discrete-frequency and broadband noise radiated by diesel engine cooling fans. Unsteady forces developed by the interaction of the fan blade with inlet flow are the dominant source for both discrete-frequency and broadband noise of the subject propeller fan. In many cases, a primary source of discrepancy between fan noise prediction and measurement is due to incomplete description of the fan inflow. Particularly, in such engine cooling systems where space is very limited, it would be very difficult, if not, impossible to measure the fan inflow velocity field using the conventional, stationary hot-wire method. Instead, the fan inflow was measured with two-component x-type hot-film probes attached very close to the leading edge of a rotating blade. One of the advantages of the blade-mounted-probe measurement technique is that it measures velocities relative to the rotating probe, which enables the acquired data to be applied directly in many aerodynamic theories that have been developed for the airfoil fixed-coordinate system. However, the velocity time data measured by this technique contains the spatially non-uniform mean velocity field along with the temporal fluctuations. A phase-locked averaging technique was successfully employed to decompose the velocity data into time-invariant flow distortions and fluctuations due to turbulence. The angles of attack of the fan blades, obtained from inlet flow measurements, indicate that the blades are stalled.

316 pages

TechOne, Automotive Engine Repair

Creator: Elisabeth H. Dorries | Technology & Engineering - 2004-12-01

When the cooling fan is inoperative the vehicle will typically overheat while idling, in traffic, or traveling slowly. Once the vehicle is up to cruising speeds the natural flow of air across the radiator is generally enough to keep the coolant ...

Publisher: Cengage Learning

About this book
This complete and concise guide takes a realistic look at the services typically performed in today’s modern automotive shop, detailing everything you need to know to repair automotive engines. Current and relevant practices are fully covered, and each engine repair topic is broken down by theory and operation, followed by diagnosis and applicable service and repair procedures. Interesting facts, engaging artwork, and friendly language all welcome readers into the material. Issues of health and safety, as well as soft skills such as communication and professionalism, are stressed throughout. Material in this book is developed in accordance with NATEF guidelines, and takes into account all the criteria needed to adequately prepare readers for the ASE Engine Repair (A1) Certification Exam.

2016 pages

Chilton's Auto Repair Manual, 1993-1997

Creator: Chilton Book Company | Technology & Engineering - 1996-10-01

Remove the 4 fan shroud retaining bolts and remove the fan shroud assembly from the radiator. 5. Remove the cooling fan blade retaining clip. 6. Remove the fan shroud insert and remove the cooling fan blade. 7. Remove the 3 cooling fan  ...

Publisher: Cengage Learning

About this book
Chilton's Perennial Edition Service Manuals contain repair and maintenance information for all major systems that may not be available elsewhere. They include repair and overhaul procedures, thousands of illustrations, and troubleshooting. This 1997 Auto Manual offers a wide range of repair information on domestic cars from 1993 to 1997. An added Special feature includes Scheduled Maintenance Interval Charts.

Cooling Directory

Cooling Fans & Blowers |
NMB’s cooling fans and blowers provide cooling solutions to your system thermal problems. The need for forced-air cooling by using an AC or DC axial fan or blower ...

Cooling Fan - The NEED Project
©2013 The NEED Project P.O. Box 10101, Manassas, VA 20108 1.800.875.5029 Cooling Fan Grade Levels: 4-6 Background

CPU Cooling Fan - How One Works - NMB -
About the Processor The Central Processing Unit, or the CPU, is the vital computing unit that forms the main execution core of a computer, and is the most important ...

Best Engine Cooling Fan - Electric Parts for Cars, Trucks ...
Equip cars, trucks & SUVs with Engine Cooling Fan - Electric from AutoZone. Get Yours Today! We know our parts and products.

Cooling Fans - Thermal Management
Oriental Motor offers a wide range of heat measure products centered on cooling fans to meet many diverse requirements. Our Axial Fans included large size and small ...


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