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194 pages

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

2007

Algermissen et al (2001) used a commercial CFD code to predict the discrete- frequency engine cooling fan noise of a ... a three dimensional compressible unsteady CFD model to investigate the rotor-strut interaction of a computer cooling fan.

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.



320 pages

New Perspectives on Computer Concepts 2014, Brief

Creator: June Jamrich Parsons, Dan Oja | Computers - 2014-03-17

Keep the area around your computer Most desktop computers have a fan mounted on the power supply that clear for good air circulation. runs continuously to maintain the proper temperature inside of the system unit. Additional cooling fans ...

Publisher: Cengage Learning



872 pages

New Perspectives on Computer Concepts 2014, Comprehensive

Creator: June Jamrich Parsons, Dan Oja | Computers - 2014-02-01

Keep the area around your computer Most desktop computers have a fan mounted on the power supply that clearfor good air circulation. runs continuously to maintain the proper temperature inside of the system unit. Additional cooling fans ...

Publisher: Cengage Learning

About this book
Take your students beyond the basics with the award-winning NEW PERSPECTIVES ON COMPUTER CONCEPTS. Designed to get all students up-to-speed on essential computer literacy skills, this market leading text goes deeper, providing students with the technical and practical information they need for academic and career success. NEW PERSPECTIVES ON COMPUTER CONCEPTS 2014 incorporates significant technology trends that affect computing and everyday life; such as concerns for data security, personal privacy, online safety, controversy over digital rights management, interest in open source software and portable applications, and more. In addition, coverage of Microsoft Windows 8 and Office 2013 will introduce your students to the exciting new features of Microsoft's next generation of software.Important Notice: Media content referenced within the product description or the product text may not be available in the ebook version.


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Computer Cooling Fan T-Shirt

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