scholarly journals AN EFFECT OF SURFACE FINISH AND SPACING BETWEEN DISCS ON THE PERFORMANCE OF DISC TURBINE

2012 ◽  
pp. 250-255
Author(s):  
BORATE H . P ◽  
MISAL N. D
Keyword(s):  
High Velocity ◽  
Lower Energy ◽  
Outer Edge ◽  
Centrifugal Forces ◽  
Test Rig ◽  
Convergent Nozzle ◽  
Nikola Tesla ◽  
Exit Port ◽  
Velocity Water ◽  
Effect Of Surface

The turbine, invented by Nikola Tesla (1856-1943), is a bladeless turbine. Tesla disc turbine and a flexible test rig have been designed and manufactured, and experimental results are presented. An analysis of the performance and efficiency of the disc turbine is carried out. The design philosophy of the flexible test rig has been explained. Notice that there are no blades whatsoever – parallel, closely spaced discs used. Resistance to fluid flow between the plates results in energy transfer to the shaft. High velocity water enters the disk pack through inlet nozzle path tangent to the outer edge of the discs. Convergent nozzle imparts high velocity water jet tangentially on disc thickness. Lower-energy water spirals toward the central exit port, adhesion, drag and centrifugal forces continue to convert kinetic energy to shaft rotational power. The results of the study represent the step towards development boundary layer turbine. It has been determined that surface roughness and spacing affects the performance of the multiple disc turbines significantly. Efficiency may be improved at least up to 45%, which has been deemed achievable by Professor Warren Rice [2].

An Effect of Spacing and Surface Finish on the Performance of Bladeless Turbine

2012 ◽  
Author(s):  
Hanumant P. Borate ◽  
Nitin D. Misal
Keyword(s):  
Surface Roughness ◽  
Surface Finish ◽  
High Velocity ◽  
Angular Speed ◽  
Outer Edge ◽  
Experimental Results ◽  
Test Rig ◽  
Convergent Nozzle ◽  
Disc Surface ◽  
Velocity Water

The Bladeless Turbine is a remarkable machine in terms of simplicity, robustness, efficiency, and applicability but little as known, even among today’s engineers, about how it works and how well it performs alongside conventional turbines. This paper presents effect of disc spacing and disc surface roughness on the performance of bladeless turbine. In this investigation, instead of blades, closely packed parallel discs are used. Resistance to fluid flow between the plates results in energy transfer to the shaft. High velocity water enters the disc pack through inlet nozzle path tangent to the outer edge of the discs. Convergent nozzle imparts high velocity water jet tangentially on disc thickness. Lower-energy water spirals toward the central exit port, adhesion, drag and impulse forces continue to convert kinetic energy to shaft rotational power. However, The Bladeless Turbine and a flexible test rig have been designed and manufactured, and experimental results are presented. An analysis of the performance and efficiency of the disc turbine is carried out. The design philosophy of the flexible test rig has been explained. Various complementary methods of measurement have been implemented and compared, and several operational experiences have been noted Experimental results for a 152mm diameter and 2mm thick discs of turbine are presented, which shows the variation of torque, output power, and efficiency as a function of angular speed. Measurements of static pressure are also taken at the inlet, Many design considerations and operational experiences are discussed. The effect of each parameter on the torque and power has been analyzed. It has been found that the spacing and surface finish has a significant effect on the power of the turbine. The maximum power obtained in this investigation was 33watts for 6discs and 0.5 mm spacing between discs with rough surface ( spiral Groove). The torque and power increases with decrease in spacing upto 0.5mm and increase in surface roughness value (Ra) 500 microns. From this investigation, it is clear that the developed bladeless turbine is working efficiently at 0.5mm spacing and 500 microns roughness disc surface.

On the failure pattern of sandstone impacted by high-velocity water jet

2015 ◽  
Vol 76 ◽  
pp. 67-74 ◽  
Author(s):  
Yiyu Lu ◽  
Fei Huang ◽  
Xiaochuan Liu ◽  
Xiang Ao
Keyword(s):  
High Velocity ◽  
Water Jet ◽  
Failure Pattern ◽  
Velocity Water

scholarly journals Removal of Interproximal Dental Biofilms by High-velocity Water Microdrops

2013 ◽  
Vol 93 (1) ◽  
pp. 68-73 ◽  
Author(s):  
A. Rmaile ◽  
D. Carugo ◽  
L. Capretto ◽  
M. Aspiras ◽  
M. De Jager ◽  
...  
Keyword(s):  
High Velocity ◽  
Velocity Water

scholarly journals Effect of Sediment Size in Hydraulic Turbine Material: A Case Study of Roshi Khola in Nepal

2013 ◽  
Vol 13 (2) ◽  
pp. 129-132
Author(s):  
Laxman Poudel
Keyword(s):  
Weight Loss ◽  
High Velocity ◽  
Hydraulic Turbine ◽  
Direct Impact ◽  
Test Rig ◽  
Reservoir Capacity ◽  
Sediment Size ◽  
Micron Size ◽  
Hydraulic Turbines

Siltation problem in Nepal is major and challenging in hydropower development. It degrades the reservoir capacity and hydraulic turbines’ efficiency. Many researches have been carried out in this field and have proven sand as major substance that erodes the turbine material, but only few researches have accounted every parameters of sand on degradation of hydraulic turbines. This paper accounts size of sediments important parameter that has direct impact on turbine material. Sediment size impact has been studied firstly by characterizing size into six layered using sieve analyzer and testing its impact using high velocity test rig at Kathmandu University. Sand samples from 20 different stations of Roshi river were collected and tested on turbine material 18Cr4Ni. It found that greater micron sizes of sediments have great impact was than relatively smaller ones. It is depicted that 300-400 micron size sediment, have highest impact with weight loss of 0.022 milligram, 212-300 micron size has 0.013 milligram weight loss, 90-212 micron size has 0.012 and below 90 micron sizes have 0.0075 milligram of weight loss. Nepal Journal of Science and Technology Vol. 13, No. 2 (2012) 129-132 DOI: http://dx.doi.org/10.3126/njst.v13i2.7725

Optimization of a dual capture element magnetic separator for the purification of high velocity water flow

2016 ◽  
Vol 73 (2) ◽  
pp. 20601 ◽  
Author(s):  
Abdallah Belounis ◽  
Rabia Mehasni ◽  
Mehdi Ouili ◽  
Mouloud Feliachi ◽  
Mohamed El-Hadi Latreche
Keyword(s):  
Water Flow ◽  
High Velocity ◽  
Magnetic Separator ◽  
Velocity Water
Sign in / Sign up

Export Citation Format

Share Document