Effect of a Stick on the Gas Turbulence Structure in a Cyclone Separator

Figures & data

FIG. 1 Experimental set up.

FIG. 2 Cyclone configuration.

TABLE 1 Type of stick and pressure drop reduction ¹ , ²

Type	Shape of cross-section	Width of cross-section	Pressure drop reduction η %
A	Cylindrical	5	32.2
B	Rectangular	5	40.1
C	Cylindrical	10	41.9
D	Rectangular	10	46.3
E	Cylindrical	15	43.6
F	Rectangular	15	53.8

FIG. 3 Effect of stick on the mean flow field (A: with stick; B: without stick). (a) Tangential velocity in different cross section; (b) Tangential velocity in different direction; (c) Axial velocity in different cross section.

FIG. 4 Effect of stick on the RMS velocity (A: with stick; B: without stick). (a) Tangential RMS velocity; (b) Axial RMS velocity.

FIG. 5 Effect of stick on the turbulence intensity (A: with stick; B: without stick). (a) Tangential turbulence intensity; (b) Axial turbulence intensity.

TABLE 2 The rotational kinetic energy reduction caused by the stick

Type	Shape of cross-section	Width of cross-section	Rotational kinetic energy reduction ψ %
A	Cylindrical	5	38.6
C	Cylindrical	10	50.2
D	Rectangular	10	54.1
^1The stick in the Table 2 is as same as in the Table 1.
^2The rotation kinetic energy reduction ψ is defined as: Ek is the rotational kinetic energy calculated in the cyclone separator without the stick, while E′k is calculated in the cyclone separator with the stick.

FIG. 6 Effect of b on the tangential velocity: (a) downstream the stick (200°); (b) upstream the stick (100°). (A: without stick; B: with stick, b = 5; C: with stick, b = 10; D: with stick. b = 15).

FIG. 7 Effect of b on the tangential RMS velocity downstream the stick (A: without stick; B: with stick, b = 5; C: with stick, b = 10; D: with stick, b = 15).

FIG. 8 Effect of b on the turbulence intensity downstream the stick (A: without stick; B: with stick, b = 5; C: with stick, b = 10; D: with stick, b = 15.

FIG. 9 Effect of cross-section shape on the tangential velocity downstream the stick (a) b = 5 (A: without stick; B: with stick, cylindrical; C: with stick, rectangular-shaped); (b) b = 10 (A: without stick; B: with stick, cylindrical; C: with stick, rectangular-shaped); (c) b = 15 (A: without stick; B: with stick, cylindrical; C: with stick, rectangular-shaped); (d) (A: without stick; B: with stick, b = 10, cylindrical; C: with stick, b = 10, rectangular-shaped; D: with stick, b = 15, cylindrical).

FIG. 10 Effect of cross-section shape on the tangential RMS velocity downstream the stick (a) b = 5 (A: without stick; B: with stick, cylindrical; C: with stick, rectangular-shaped); (b) b = 10 (A: without stick; B: with stick, cylindrical; C: with stick, rectangular-shaped); (c) b = 15 (A: without stick; B: with stick, cylindrical; C: with stick, rectangular-shaped).

Effect of cross-section shape on the turbulence intensity downstream the stick (a) b = 5 (A: without stick; B: with stick, cylindrical; C: with stick,rectangular-shaped); (b) b = 10 (A: without stick; B: with stick, cylindrical; C: with stick, rectangular-shaped); (c) b = 15 (A: without stick; B: with stick, cylindrical; C: with stick, rectangular-shaped).