Theory and Design for Mechanical Measurements
6th Edition
ISBN: 9781118881279
Author: Richard S. Figliola, Donald E. Beasley
Publisher: WILEY
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Chapter 9, Problem 9.47P
Aircraft airspeed is measured using a pitot (impact) tube and a static port, each mounted somewhere on the external wing or airframe, and connected by tubes across an airspeed indicator. The airspeed indicator is a differential pressure transducer device calibrated to read speed. Explain why rain impacting the opening of the pitot tube during flight is unlikely to flood the airspeed indicator.
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The altimeter on a low-speed Piper Aztec reads 3000ft. A pitot tube mounted on the wing tip measures a pressure of 2650 lb/ft^2. If the outside air temperature is 600 R, What is the equivalent airspeed? Answer should be in English system.
The drag force on an airship must be determined by testing with a reduced-scale model. The tests are carried out in a water tunnel, where the airship model is fixed to a support instrumented with a force sensor. The speed of the flow that affects the model is controlled by a variable speed pump that is the one that originates the flow towards the model. The scale is 1:20, μwater=1.01x10-3 kg/ms, μair= 1.85x10-5 Pa-s, ρair= 1.25kg/m3, ρwater=1000 kg/m3. Determine: a) the dimensionless numbers of the situation b) The VM if VP=36km/h c) The power of the prototype airship if FM= 1 649 N.
3. In the Figure below, determine: (a) the calibration range of the DP transmitter in inches of water,
(b) the differential pressure head in inches water at the transmitter at 75% level
Given:
100%
S
HLL
NLL
LLL
Xx
Y3=130 in.
SG3=1.26
S = 60 in
Y2 = 30 in.
SG2=1.12
Y1 = 15 in.
SG1 = 0.82
Chapter 9 Solutions
Theory and Design for Mechanical Measurements
Ch. 9 - Prob. 9.1PCh. 9 - 9.2 State the following pressures as absolute...Ch. 9 - A water-filled manometer is used to measure the...Ch. 9 - Prob. 9.4PCh. 9 - 9.5 The pressure differential across an orifice...Ch. 9 - Show that the static sensitivity of an inclined...Ch. 9 - Prob. 9.7PCh. 9 - Show that the instrument (systematic) uncertainty...Ch. 9 - A strain gauge, diaphragm pressure transducer...Ch. 9 - Select a practical fluid to use in a manometer to...
Ch. 9 - An air pressure over the 200- to 400-N/m2 range is...Ch. 9 - Calculate the design-stage uncertainty in...Ch. 9 - The pressure drop across a valve through which air...Ch. 9 - Estimate the sensitivity (pF/mm) of a capacitance...Ch. 9 - A diaphragm pressure transducer is calibrated...Ch. 9 - A diaphragm pressure transducer is coupled with a...Ch. 9 - Prob. 9.17PCh. 9 - A 2.0 mm thick circular steel diaphragm (Em = 200...Ch. 9 - Estimate the differential pressure limit for a...Ch. 9 - The pressure fluctuations in a pipe filled with...Ch. 9 - What is the sensitivity of a pitot-static tube...Ch. 9 - A pitot-static pressure probe inserted within a...Ch. 9 - A tall pitot-static tube is mounted through and...Ch. 9 - The pressure transmission line response equation...Ch. 9 - Prob. 9.26PCh. 9 - Prob. 9.28PCh. 9 - Compare the inertance of water in a 0.2-m-long...Ch. 9 - The output from a resting healthy human adult...Ch. 9 - Prob. 9.31PCh. 9 - A pressure drop of 213 Pa is measured between two...Ch. 9 - Wall pressure taps (e.g., Figs. 9.19 and 9.21) are...Ch. 9 - Prob. 9.34PCh. 9 - Prob. 9.35PCh. 9 - Determine the resolution of a manometer required...Ch. 9 - A long cylinder is placed into a wind tunnel and...Ch. 9 - Prob. 9.38PCh. 9 - Prob. 9.39PCh. 9 - What is the sound pressure in pascals if the...Ch. 9 - A 6-mm-diameter pitot-static tube is used as a...Ch. 9 - For the thermal anemometer in Figures 9.31 and...Ch. 9 - Determine the static sensitivity of the output...Ch. 9 - A laser Doppler anemometer setup in a dual-beam...Ch. 9 - A set of 5,000 measurements of velocity at a point...Ch. 9 - Aircraft airspeed is measured using a pitot...
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