6 / 8
nitrogen and hydrogen 1.5; 3.5; 50; 10; 20 m
3
/s. The suction pressure for
nitrogen is
p
= 1
∙
10
−
6
Pa, for hydrogen it is
p
= 1
∙
10
−
5
Pa, and the
forevacuum pressure is
p
f
= 0
.
1
Pa. The calculation results are given in
the table.
The following characteristics were selected as the controlled parameters:
the blades angle
α
, the channels relative width
a/b
, the channels relative
height
λ
. Flow channel optimization calculation was performed for
optimality criteria: the volume
V
fch and flow channel mass
M
.
The following design arrangements were analyzed (see Table): the
conventional flow channel with an axial flow (1), the flow channel with
Comparing optimal parameters for different design variants of VMP flow channels
S
H
, m
3
/s
Gas
Design
N
0
c
/N
a(m)
V
fch
, m
∙
10
3
M
, kg
1
15/–
6.9
8.9
N
2
2
9/13
4.4
4.8
1.5
3
9/13
5.6
5.3
1
46/–
23
30.8
H
2
2
35/19
18
22.4
3
27/26
17
16.7
1
14/–
15
19.3
N
2
2
9/10
10
11.4
3.5
3
9/11
15.3
13.7
1
45/–
53
70.4
H
2
2
33/18
39.6
49.1
3
27/25
47.3
40.8
1
13/–
39.7
54.4
N
2
2
7/13
22
26.0
5
3
8/11
32.5
34.5
1
44/–
148
206.0
H
2
2
34/20
110
142.0
3
25/28
109
105.8
1
11/–
110
157.1
N
2
2
7/8
73
90.9
3
7/10
85
89.6
10
1
36/–
380
529.9
H
2
2
26/18
270
359.0
3
21/25
255
267.0
1
11/–
230
314.4
N
2
2
7/7
145
181.0
3
7/10
181
195.7
20
1
36/–
755
1066.4
H
2
2
23/24
487
623.0
3
21/24
500
557.0
8
ISSN 0236-3941. HERALD of the BMSTU. Series Mechanical Engineering. 2014. No. 5