CAVITATION IN MARINE CENTRIFUGAL PUMPS AND PIPES In a centrifugal pump during its operation the fluid that enters is accelerated by the impeller. At impeller the pressure lowers as the velocity increases (Bernoulli equation). The flow area at the eye of the impeller is usually smaller than either the flow area of the pump suction piping or the flow area through the impeller vanes. When the flowing liquid passes from the eye of the impeller the area that is smaller results in the increase of the velocity followed by the decrease of the pressure. If pressure is lower and/or the temperature is higher than the saturation pressure/temperature some fluid changes to vapour forming tiny bubbles.
To analyse the flow pattern inside the shock absorber valves (shim stack) using fluid structure interaction analysis 2. To model the behaviour and physics of the shock absorber valves using finite element analysis software system 3. To describe the practical aspects of the simulation process and the results of the simulation 1.3 PROJECT OUTCOMES Upon completion of this project, we should be able to : 1. Run a complete simulation on the shock absorber valves based on the fluid structure interaction analysis using finite element analysis (FEA) software 2. Explain and describe the flow analysis inside the shock absorber valves based on the orientation and deflection of the valves 3.
Figure CATIA modeling of DLR scramjet combustion chamber and planer strut injector. Figure 2: combustion chamber model 1 3D planer strut injector A wedge-shaped strut is placed in the combustion chamber downstream of the nozzle. The height of the 32 mm long strut is 0.295 mm and mass flow rate of strut is 1.5 to 4.0g/s. BOUNDARY CONDITIONS In the present study three different types of boundaries are applied: inflow, outflow and fixed walls. The flow fields under consideration here are supersonic.
It is an instability problem thus establishment of collapse rating is more difficult than the determination of burst rating. It depends upon: Tubing diameter Thickness Ovality of pipe There are four collapse models and the slenderness ratio is the criteria of their selection. Elastic Collapse In this collapse the deformation is elastic and the yield stress of the tubing is negligible. The collapse is given by; Transitional Collapse The collapse is given by; Plastic Collapse The collapse is given
To prevent the output voltage from rising higher than the rating of the components, the voltage feedback is mapped to the internal comparators, which can trip of the PWM in case the output voltage of the boost converter exceed the maximum voltage which is shown in fig.4.2. This process is repeated till the system reaches MPP. This is illustrated in the following Fig 4.4 To evaluate the performance of the Perturb & Observe and Incremental Conductance methods the solar explorer kit ‘TMDSSOLAR (P/C) EXPKIT’ is used. The TMDSSOLARPEXPKIT ships with the F28035 MCU control card is a part of a Piccolo family in the C2000 MCU
Fig 1.2 Failure of a Cylindrical Shell. 1.3.1 Circumferential or Hoop Stress: Consider a thin tube shaped shell subjected to an inner weight as appeared in Fig. (an) and (b). Malleable stretch acting in a bearing distracting to the outline is called circumferential or band push. As such, it is an elastic weight on longitudinal area (or on the round and hollow
The reflections of the compressive wave generate tensile and shear waves, which may propagate through pre-existing cracks and further widens them apart (Fourney, 1993) due to the phase difference between the two wave types. After stress wave, propagations and gases with high temperature and pressure expand the original borehole by extending radial cracks and penetrate into it. The high-pressure gases tear these cracks open and extend them. The explosive gases entrapped in the rock mass push the rock mass forward and bend the face causing flexural rupture (Ash, 1973). Shear fracturing occurs when the adjoining rock is displaced at different times or at different rates by the
Chapter 5 Analysis of Results and Comparison with other compensation methods 5.1 Experimental setup at BHEL Engineers training laboratory The Laboratory setup for the PWM Switching auto-transformer for Voltage sag mitigation, the laboratory setup validates the PSCAD results obtained in chapter 4 with lower range approximately meets the higher range. Figure 5.1 shows the schematic of the test setup. The actual test setup is shown in fig 5.2. The test system is built for a voltage of single phase 230V, while IGBT and power diodes are of 600V. The experimental setup consists of an PWM switch of an IGBT and four power diodes connected in such a way that the switch acts as bidirectional switch, a two winding transformer of 1:1 ratio is connected
REFERENCES () Flow in Pipes, Available at: https://www.uio.no/studier/emner/matnat/math/MEK4450/h11/undervisningsmateriale/modul-5/Pipeflow_intro.pdf (Accessed: 1/12/2015). Rick Sellens, Ph.D, P.Eng () Losses in Pipes, Available at: http://me.queensu.ca/People/Sellens/LossesinPipes.html (Accessed: 1/12/2015). Jayanti, Sreenivas () BENDS, FLOW AND PRESSURE DROP IN, Available at:http://www.thermopedia.com/content/577/?tid=104&sn=1422 (Accessed:
 which gives a separate correlation for high pressure and low pressure flow. In this paper, to avoid discontinuity at the transition pressure; the correlation of Gopalakrishnan  which is a combination of two suggested correlations of Downar-Zapolski is employed: θ=6.51×〖10〗^(-4) α^(-0.54) [(p_s (T_in )-p)/(p_s (T_in )