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Search Completed | Title | INVESTIGATIONS OF AERODYNAMICS OF TESLA BLADELESS MICROTURBINES
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Text | INVESTIGATIONS OF AERODYNAMICS OF TESLA BLADELESS MICROTURBINES | 002
478 P. Lampart, Ł. Jędrzejewski
layer thickness. Therefore, the gaps between the disks should depend on the occurring flow conditions and physical properties of the working fluid. On the other hand, the thickness of the disks and the distances between them are also limited by the material strength and the technology of manufacture and assembly. An example of the multidisk rotor construction of the Tesla turbine found in the patent documentation (Hicks, 2005) is shown in Fig. 1.
Fig. 1. Rotor of a multidisc Tesla bladeless turbine (Hicks, 2005)
The supply of the Tesla turbine is accomplished by one or several noz- zles discretely located along the circumference. The nozzles are tilted under a certain angle to the disk tangent. The working fluid flows between the disks spirally from the outer to inner radius and transfers energy to the rotating disks. The medium flows out in the axial direction through a number of holes in the disks situated near the turbine shaft. The efficiency of the Tesla turbine depends on many parameters, namely on: pressure, temperature and velocity conditions between the disks, number, diameter, thickness and distance be- tween the disks as well as on the state of the disk surface, rotational speed of the rotor, number and arrangement of the supply nozzles, etc.
In the subject-matter literature, examples of experimental research refer- ring to the following models of Tesla micro-turbines can be found:
• ∼ 1.8 kW output power, 18 000 rpm, 16% efficiency (Mikielewicz et al., 2008)
• ∼ 1.5 kW output power, 12 000 rpm, 23% efficiency (Hicks, 2005; Rice,
• ∼ 3kW output power, 15000rpm, 32% efficiency (Gruber and Earl, 1960)
Image | INVESTIGATIONS OF AERODYNAMICS OF TESLA BLADELESS MICROTURBINES
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