# Hot Wire Laboratory

Topics: Fluid dynamics, Digital signal processing, Calibration Pages: 6 (1619 words) Published: March 28, 2013
THE
UNIVERISTY OF MANCHESTER

SCHOOL OF MECHANICAL, AEROSPACE AND CIVIL ENGINEERING

LABORATORY REPORT
INSTRUMENTATION AND MEASUREMENT
VORTEX SHEDDING FROM A CYLINDER & DATA ACQUISITION

NAME:MANISH PITROLA
STUDENT ID:75050320
COURSE:MEng MECHANICAL ENGINEERING
DUE DATE:27TH NOVEMBER 2012

Then by simple algebraic rearranging the frequency is found to be 133.3Hz. Therefore the maximum frequency experienced is 2f = 2*133.3 = 266.6Hz. To obtain the optimum sampling frequency we simply by using Nyquist theory multiply the maximum frequency by 2.5 providing an optimum sampling rate of 666.5Hz. The values for the sampling rate were taken as 330Hz, 660Hz and 1320Hz for experimental purposes to study the over and under sampling of data.

4) In the experiment the hotwire was calibrated in terms of velocity vs (E-E0)2. Plot out the calibrations for U = B((E-E0)2)n and the various polynomials. Compare the different lines. Which is the best to use?

Figure [ 1 ]

Figure [ 2 ]

Figure [ 3 ]

Figure [ 4 ]
From the above graphs is can be seen that the best...