Changes between Version 133 and Version 134 of WikiStart


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Timestamp:
Oct 3, 2016, 11:51:00 AM (4 years ago)
Author:
davarpan1s
Comment:

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  • WikiStart

    v133 v134  
    112112||fixapex2_2809c|| X4 || 18.4 || 20 - 6 || 0 || 1 || 5.5 || 5 || 30 ||
    113113||fixapex2_2809d|| X4 || 18.4 || 20 - 6 || 0 || 1 || 5.5 || 5 || 30 ||
    114 
     114||rotstr1_2909a|| X1 || 20.3 || 20 - 5.64 || 0.083 || 1 || 5.5 || 30 || 30 ||
     115||rotstr1_2909b|| X1 || 20.5 || 20 - 6 || 0.083 || 1 || 5.5 || 15|| 30 ||
     116||rotstr1_3009a|| X1 || 20.4 || 20 - 5.83 || 0.083 || 1 || 5.5 || 30 || 30 ||
     117||rotstr1_3009b|| X1 || 20.4 || 20 - 5.5 || 0.083 || 1 || 5.5 || 35 || 30 ||
     118||rotstr1_3009c|| X1 || 20.4 || 20 - 5.5 || 0.083 || 1 || 5.5 || 10 || - ||
    115119[[BR]]
    116120
     
    121125Experiment name: fixstr1_1909a
    122126Filenames: fixstr1_1909a1, fixstr1_1909a2
    123 Location: Position X1 (75% of the way down the straight section, 58 cm upstream from the end of straight section). Input rate: 12 l/s, density excess: 20 kg/$m^3$. Water was very cloudy to the extent that we were not able to use the laser. No siphon rig was used. Running basal ADV with ADV !#1 located 7.2 cm from the base. ADV just measured at one point (no traverse measurement).
     127Location: Position X1 (75% of the way down the straight section, 58 cm upstream from the end of straight section). Input rate: 12 l/s, density excess: 20 kg/m^3^. Water was very cloudy to the extent that we were not able to use the laser. No siphon rig was used. Running basal ADV with ADV !#1 located 7.2 cm from the base. ADV just measured at one point (no traverse measurement).
    124128
    125129Experiment started at 2:45pm and stopped at 3:15 pm. The flow automatically stopped part way through as a valve was not open for recirculating water. Part way through red dye was added to visualise the current. Dye visualisation suggested pretty thin flow on the inner bank and significant super elevation on the outer bank. Some perturbation was observed on the surface of the flow at the outer bank, but otherwise the flow surface appears quite smooth, and mixing appeared to be very low. Mean maximum flow velocity from raw output was around 20 - 25 cm/s. ADV and UVP measured twice, the first is referred to as fixstr1_1909a1 and this had a velocity range of 0.3 m/s on the ADV setting, and 0.25 m/s for the UVP. Instantaneous flow velocities were faster than anticipated, as a result of the steep slope (3.5 degrees) with flow wrapping on both instruments so the velocity range was increased on the ADV and the UVP. A second run period fixstr1_1909a2 had a velocity range of 0.5 m/s on the ADV setting. The UVP setting was 680 mm/s (0.68 m/s).
     
    163167Experiment name: fixstr1_2709a,b. 
    164168Filenames: fixstr1_2709a, fixstr1_2709b.
    165 Location: Position X1 (75% down straight section, 58 cm upstream from the end of the straight section). Input rate 6 l/s. Density excess 20 kg/m3. Laser was not used in the experiments today. Running basal ADV with ADV !#1 located 7.2 cm, ADV !#2 located at 10 cm and ADV !#3 located at 12 cm above channel bed.
     169Location: Position X1 (75% down straight section, 58 cm upstream from the end of the straight section). Input rate 6 l/s. Density excess 20 kg/m^3^. Laser was not used in the experiments today. Running basal ADV with ADV !#1 located 7.2 cm, ADV !#2 located at 10 cm and ADV !#3 located at 12 cm above channel bed.
    166170
    167171Fixstr1_2709a: The goal was to examine the flushing time of the inlet box to see how it behaves once the PVC tubes were installed. One conductivity probe (C1T1) was mounted at the centerline just before the flow straightener (metallic honeycomb). Started with 6 l/s and waited for 5 min to see how inlet box, UVP and pump behaved. The UVP and siphon pump were turned on to fix the suspected pulse that the pump imparted to the UVP. This did not resolve the SNR issue. The inlet box took a long time to reach a steady conductivity value. It was suggested to start with a higher flow rate and then reduce the flow rate to 6 l/s. The ADV and UVP data were still noisy. No siphon sampling was done.
    168172
    169 fixstr1_2709b: It was suggested to install an array of three conductivity probes in a cross-section just before the honeycomb in the inlet box. Only one additional probe was available. As such, two conductivity probes were mounted in the cross section just before the flow straightener (metallic honeycomb): one at the centerline (C2 green) and one 5 cm?? from the right wall (C1T1 black), looking downstream. The traverse was able to move vertically in every cross-section position and the previously outstanding issues have been resolved. Water was initially pumped with a flow rate of 15.28 l/s (55 m3/h). This was the highest achievable flow rate. The water was pumped at this rate for 2 minutes and then reduced to 6 l/s. This seems to achieve the desired effect of reaching a steady conductivity value in a short amount of time in the inlet box. The UVP was set over 10 minutes, but still showed noisy data. No siphon sampling was conducted.
     173fixstr1_2709b: It was suggested to install an array of three conductivity probes in a cross-section just before the honeycomb in the inlet box. Only one additional probe was available. As such, two conductivity probes were mounted in the cross section just before the flow straightener (metallic honeycomb): one at the centerline (C2 green) and one 5 cm?? from the right wall (C1T1 black), looking downstream. The traverse was able to move vertically in every cross-section position and the previously outstanding issues have been resolved. Water was initially pumped with a flow rate of 15.28 l/s (55 m^3^/h). This was the highest achievable flow rate. The water was pumped at this rate for 2 minutes and then reduced to 6 l/s. This seems to achieve the desired effect of reaching a steady conductivity value in a short amount of time in the inlet box. The UVP was set over 10 minutes, but still showed noisy data. No siphon sampling was conducted.
    170174
    171175'''Wednesday, September 28th 2016'''
     
    173177Experiment name: fixstr1_2809a and fixapex2_2809b, c, d. 
    174178Filenames: fixstr1_2809a, fixapex2_2809b, fixapex2_2809c, fixapex_2809d.
    175 Location for fixstr1_2809a: Position X1 (75% down straight section, 58 cm upstream from the end of the straight section). Location for fixapex2_2809b, c, d: Position X4 (at the centre of the second apex).  Input rate 20 l/s (initial ~ 2 minutes of each run) then reduced to 6 l/s. Density excess 18.4 kg/$m^3$. Laser was not used in the experiments today. Running basal ADV with ADV !#1 located 7.2 cm, ADV !#2 located at 10 cm and ADV !#3 located at 12 cm above channel bed.
     179Location for fixstr1_2809a: Position X1 (75% down straight section, 58 cm upstream from the end of the straight section). Location for fixapex2_2809b, c, d: Position X4 (at the centre of the second apex).  Input rate 20 l/s (initial ~ 2 minutes of each run) then reduced to 6 l/s. Density excess 18.4 kg/m^3^. Laser was not used in the experiments today. Running basal ADV with ADV !#1 located 7.2 cm, ADV !#2 located at 10 cm and ADV !#3 located at 12 cm above channel bed.
    176180
    177181fixstr1_2809a: The goal is to increase the seeding and test the ADVs and UVP for less noise. A new stem ADV was mounted to reduce the noise. The UVP didn’t change in terms of noise issue, so the problem does not lie with the seeding density. Another suggestion was to move the UVP box back to the back bench to reduce interference from the electronics on the traverse. Minimal improvement was seen on the ADV profile. The seeding seems to be getting stuck in the inlet box behind the flow straightening baffles - this was visually observed by a buildup of foam in the inlet box.