Spillway Test - Bureau of Reclamation

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RESULTS AND DISCUSSION Air Slot Instrumentation The average air velocities were measured with the two pitot-static probes and are shown in table 2. Table 2. - Average air velocity, V vs. spillway discharge, Q Discharge Q,ft3/s Air Velocity V, ft/s Box 10 - Probe 1 Box 11 - Probe 2 6,500 10,000 20,000 35,000 50,000 -* 64.1 124.9 231.8 113.1 247.3 *Denotes a negative differential pressure on the pitot-static probe. Negative values are possible due to positioning the probes to read maximum air velocities at 20,000 ft3/s and 50,000 ft3/s. A comparison of these velocities with scaled model values is shown on figure 3. The single point velocity data can be integrated into a volumetric flowrate by assuming a velocity distribution in the slot. A standard logarithmic distribution was assumed along with symmetric performance of the slot. A comparison of air demand, for model, prototype, and computed data is shown on figure 4. It should be noted that measurements in the model and prototype only reflect air demand passing through the slot. Additional air is entrained through shear drag on the free surfaces of the jet and at flows below 30,000 ft3/s air may enter beneath the jet downstream from the slot because the sides of the jet are not sealed against the tunnel walls. 10
2Sl.1 GLEN CANYON DAM - LEFT SPILLWAY AVERAGE AIR VELOCITY IN THE SLOT 211.1 - ~ 1~1 - > I - t- ..... g J L&J > 0:: 1&1 ..... < ~I ohQ.8WmL A PROTOTYPE DATA 11 - I - I I DISCHARGE - Q (ft3/.) I I -Figure 3. - Air velocity measurements in the air slot. 11
Page 1 and 2: July 1985 Engineering and Research
Page 3 and 4: SPILLWAY TESTS AT GLEN CANYON DAM b
Page 5 and 6: CONTENTS Introduction . . . . . . .
Page 7 and 8: INTRODUCTION Tests were performed o
Page 9: 1 ' I ------------- (Left spl J Iwa
Page 12 and 13: Data Acquisition The data acquisiti
Page 14 and 15: TESTING The proposed test program c
Page 18 and 19: Lit GLEN CANYON DAM - LEFT SPILLWAY
Page 20 and 21: ..... 0'1 ,.... 25.8 N c .... 28.8
Page 22 and 23: ...... co 25.0 r"-. (\! c or- 20.0
Page 24 and 25: N ,.... 25.0 N c: .... 20.0 "..c -
Page 26 and 27: N N .--.. 25.0 ("\l C .... '\. -C 2
Page 28 and 29: N ,-,. 25.0 N c:: .,.. 20.0 ".0 --
Page 30 and 31: I\) 0\ ,... 25.B N C .- 2B.B '\. ..
Page 32 and 33: ,-.. 25.0 GLEN CANYON DAM: LEFT SPI
Page 34 and 35: 25.8 GLEN CANYON DAM LEFT SPILLWAY
Page 36 and 37: GLEN CRNYON DRM LEFT SPILLWRY Sta.
Page 38 and 39: CONCLVSIONS Evaluation of all proto
Page 41: APPENDIX
Page 44 and 45: Travelers: K. Warren Frizell and Le
Page 46 and 47: (a) Front face with tap. (b) Rear f
Page 48 and 49: (a) Kistler flushmount dynamic cell
Page 50 and 51: Figure 5. - Air velocity probe usin
Page 52 and 53: (a) Air slot and probe locations fr
Page 54 and 55: (a) Water diverter being placed for
Page 56 and 57: (a) Pulling signal wire into box 9.

Spillway Test - Bureau of Reclamation

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