Twirled air swirler

E qrerimental and theoretical research studies of hydrod5mamics of a scrubber with twirled air swirler are conducted. 

Calculation of a twirled air swirler is offered for designing, being based on the theory of centrifugal fans, in terms of quantities and directions of rotation of guide vanes. 

Results of experiences on research of a twirled air swirler have shown that optimum speed of twirl, a influences various gas—liquid and de-... 

Except operating conditions, optimum speed of twirl a influences as well design data of the investigated apparatus. In Figure 4.8, dependence of a (0, on diameter of a twirled air swirler is illustrated. 

From schedules it is visible that with the decrease of criterion of Stokes magnitude of effective length of a shovel sharply increases and at StK. 05 tends to infinity. Hence, corpuscles for which StK<0.05 practically cannot be trapped in a twirled air swirler. 

Motion of corpuscles in shovels of a twirled air swirler in a curvilinear coordinate system, representing streamlines of gas and orthogonal curves to them is observed. The corpuscle kinetic energy is defined. 

Recommendations are resulted only on packaging a twirled air swirler ... 

On the basis of the analysis of builds of modem apparatuses for gas clearing the d5mamic spray scmbber build is devised and taken out for a patent. The apparatus is supplied twirled by an air swirler and the central pipe for supply of an irrigating liquid. A centrifugal force originating at twirl... 

After data handling, presented in the schedule (see Figure 4.2), we will gain dependence of optimum speed of twirl on an air swirler direction of rotation. 

Thus, by generalizing the results of research of effect of an angle of installation of blades of an air swirler and the direction of rotation, it is possible to draw a conclusion that peak efficiency of separation is secured at installation of blades on an angle a=10- -30 and a negative direction of rotation, that is, a= 100+110°. The question of an aerodynamic roll forming of guide vanes of an air swirler with an estimation of its effect on hydrodynamics and efficiency of process of separation is in detail observed in-process (Usmanova, 2013). It is necessary to note that efficiency of separation raises at an inclination of blades toward air swirler twirl tiiat it is possible to explain decrease of tangential speeds of gas and firm corpuscles therefore, an inertial force increases. However, the power demand thus increases by the drive that can cause decrease in efficiency of the scrubber. 

Empirical dependence for calculation of optimum speed of twirl of the air swirler, considering the direction of rotation of its guide vanes, and also operating conditions of process of clearing of gas emissions is gained. 

A swirl angle Air swirler twirl Design data Optimum speed Quantity of blades The direction of rotation... 

Air swirler design data are one of the momentous geometrical sizes of a scrubber and define almost all other sizes. As magnitude of a centrifugal force is inversely proportional to twirl radius, the overall performance depends on the diameter of the scrubber. The diameter of the scmbber, the centrifugal force more developing it and that above its separating ability less [1-8]. 

It is possible to consider that the corpuscle in twirled shovels of an air swirler will be separated, if it attains a wall of blades. This condition allows to design effective length of blades h m which the corpuscle of the set size is separated (Figure 5.2). 

On the basis of the obtained results it is possible to define effective length of twirled blades of the air swirler, necessary for trapping corpus-... 

Calculation on the treated equations has shown that in the accepted limits of change of criterion of Stokes, speed of gas in shovels and angular speed of twirl of an air swirler magnitude of effective length of blades are negative. 

Researches show (Kutepov, 1977 and Uollis, 1972) that velocity profiles of a gas stream for geometrically similar air swirlers automodeling to diameter the rotary connection and to a gas rate. In the installed stream gate out an axial zone of quasifirm twirl and a peripheral zone of potential twirl with the matching approached profiles (Kutepov, 1977) ... 

Equality of design data n testifies to identity of aerodynamic characteristics of the twirled streams on an exit from geometrically similar air swirlers of the same type. 

TABLE 16.1 Design data of air swirlers and aerodynamic characteristics of the twirled stream created by them... 

After that, the gas stream bends around an air swirler on an entry, changing a traffic route, and initiates to be twirled in a positive allowance between air swirlers, forming turbulent gas-liquid a layer (mobile foam). Attaining a hole in an air swirler on an exit, gas passes through it and is inferred from the apparatus. The separated sludge is washed off by a liquid and by means of an inclination of the cylindrical chamber 1 is carried on an overflow pipe sludge 10 in the sludge remover 11. 

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