Preliminary Test of Gas Wave Ejector in Coalbed Methane Well Site and Impact Analysis of Fluid Medium Characteristics on Its Pressure Port Design

Table 5

Comparison of calculation results under different pressure ratios.

Number	(MPa)	(MPa)	(MPa)	α	β	(mm)
1	3.12	2.60	3.00	1.20	1.15	4.56	No
2	3.12	2.80	3.00	1.11	1.07	3.89	No
3	3.51	2.40	3.00	1.46	1.25	2.40	No
4	3.51	2.60	3.00	1.35	1.15	1.50	No
5	3.51	2.80	3.00	1.25	1.07	/	Yes
6	4.15	2.40	3.00	1.73	1.25	0.22	No
7 (ref.)	4.15	2.60	3.00	1.60	1.15	0.00	No
8	4.15	2.80	3.00	1.48	1.07	/	Yes
9	4.55	2.40	3.00	1.90	1.25	-1.14	No
10	4.55	2.60	3.00	1.75	1.15	/	Yes
11	4.55	2.80	3.00	1.63	1.07	/	Yes
12	5.20	2.40	3.00	2.17	1.25	-2.02	No
13	5.20	2.60	3.00	2.00	1.15	/	Yes
14	5.20	2.80	3.00	1.86	1.07	/	Yes