The Influence Mechanism of Intake Structure on Scavenging Performance

doi:10.12382/bgxb.2024.0867

Abstract

Abstract:

In order to explore the influence of various inset structures on scavenging performance,the orthogonal test of inset structure is carried out based on four inset structural parameters,namely,inlet wall thickness,inlet shape,inlet offset and number of inlets.The test results show that:the intake structure of a uniflow scavenging opposed-piston two-stroke diesel engine affects the overall performance of engine by influencing the swirl strength and flow resistance of intake air.The swirl intensity of the intake stream is adjusted by changing the inclination angle,the length and width of inclined plane of the intake structure.The total inlet contact surface affects the flow resistance by changing the intake angle of intake structure.The scavenging performance can be adjusted by changing the inlet flow intensity,and the exhaust gas backflow can be inhibited by changing the inlet flow resistance.It is found that the inlet wall thickness is a significant factor for regulating the scavenging performance of a opposed-piston two-stroke diesel engine.

Key words: two-stroke diesel engine, scavenging performance, intake structure, orthogonal test

WANG Zengquan, LIANG Yongsen, WANG Wenxiao, LI Hong, SHI Dayu. The Influence Mechanism of Intake Structure on Scavenging Performance[J]. Acta Armamentarii, 2024, 45(S2): 65-72.

Figures/Tables 19

References 21

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因素	水平
因素	1	2	3
进气口壁/mm	10	20	30
进气口倾角/(°)	78/75	75/75	72/75
进气口偏/mm	负向5	0	正向5
进气口数量	8	10	12

因素	水平
因素	1	2	3
进气口壁/mm	10	20	30
进气口倾角/(°)	78/75	75/75	72/75
进气口偏/mm	负向5	0	正向5
进气口数量	8	10	12

测试编号	因素水平					DR	最大空气捕获量/g	SR	SE	最大废气回流量/g
测试编号	A	B	A×B	C	D	DR	最大空气捕获量/g	SR	SE	最大废气回流量/g
试验1	1	1	1	1	1	1.508	2.436	0.220	0.940	0.153
试验2	1	1	1	1	2	1.511	2.449	0.515	0.940	0.140
试验3	1	1	1	1	3	1.490	2.463	0.604	0.944	0.154
试验4	1	2	2	2	1	1.541	2.399	0.295	0.937	0.148
试验5	1	2	2	2	2	1.524	2.391	0.479	0.934	0.147
试验6	1	2	2	2	3	1.498	2.421	0.657	0.938	0.147
试验7	1	3	3	3	1	1.529	2.382	0.402	0.934	0.142
试验8	1	3	3	3	2	1.513	2.373	0.404	0.932	0.140
试验9	1	3	3	3	3	1.517	2.367	0.627	0.931	0.138
试验10	2	1	1	3	1	1.518	2.428	0.454	0.942	0.151
试验11	2	1	2	3	2	1.487	2.475	0.685	0.948	0.151
试验12	2	1	3	3	3	1.483	2.421	0.854	0.941	0.140
试验13	2	2	1	1	1	1.452	2.517	1.437	0.953	0.151
试验14	2	2	2	1	2	1.461	2.472	1.712	0.947	0.150
试验15	2	2	3	1	3	1.458	2.473	1.848	0.947	0.149
试验16	2	3	1	2	1	1.470	2.449	1.394	0.944	0.144
试验17	2	3	2	2	2	1.473	2.419	1.663	0.939	0.142
试验18	2	3	3	2	3	1.481	2.390	1.882	0.936	0.139
试验19	3	1	3	2	1	1.437	2.522	1.522	0.955	0.151
试验20	3	1	3	2	2	1.449	2.476	1.215	0.947	0.156
试验21	3	1	3	2	3	1.455	2.467	1.035	0.947	0.157
试验22	3	2	1	3	1	1.464	2.441	0.824	0.941	0.150
试验23	3	2	1	3	2	1.470	2.428	0.965	0.941	0.150
试验24	3	2	1	3	3	1.470	2.408	0.989	0.938	0.150
试验25	3	3	2	1	1	1.441	2.484	1.839	0.950	0.150
试验26	3	3	2	1	2	1.454	2.420	2.200	0.941	0.147
试验27	3	3	2	1	3	1.443	2.442	2.223	0.943	0.144

测试编号	因素水平					DR	最大空气捕获量/g	SR	SE	最大废气回流量/g
测试编号	A	B	A×B	C	D	DR	最大空气捕获量/g	SR	SE	最大废气回流量/g
试验1	1	1	1	1	1	1.508	2.436	0.220	0.940	0.153
试验2	1	1	1	1	2	1.511	2.449	0.515	0.940	0.140
试验3	1	1	1	1	3	1.490	2.463	0.604	0.944	0.154
试验4	1	2	2	2	1	1.541	2.399	0.295	0.937	0.148
试验5	1	2	2	2	2	1.524	2.391	0.479	0.934	0.147
试验6	1	2	2	2	3	1.498	2.421	0.657	0.938	0.147
试验7	1	3	3	3	1	1.529	2.382	0.402	0.934	0.142
试验8	1	3	3	3	2	1.513	2.373	0.404	0.932	0.140
试验9	1	3	3	3	3	1.517	2.367	0.627	0.931	0.138
试验10	2	1	1	3	1	1.518	2.428	0.454	0.942	0.151
试验11	2	1	2	3	2	1.487	2.475	0.685	0.948	0.151
试验12	2	1	3	3	3	1.483	2.421	0.854	0.941	0.140
试验13	2	2	1	1	1	1.452	2.517	1.437	0.953	0.151
试验14	2	2	2	1	2	1.461	2.472	1.712	0.947	0.150
试验15	2	2	3	1	3	1.458	2.473	1.848	0.947	0.149
试验16	2	3	1	2	1	1.470	2.449	1.394	0.944	0.144
试验17	2	3	2	2	2	1.473	2.419	1.663	0.939	0.142
试验18	2	3	3	2	3	1.481	2.390	1.882	0.936	0.139
试验19	3	1	3	2	1	1.437	2.522	1.522	0.955	0.151
试验20	3	1	3	2	2	1.449	2.476	1.215	0.947	0.156
试验21	3	1	3	2	3	1.455	2.467	1.035	0.947	0.157
试验22	3	2	1	3	1	1.464	2.441	0.824	0.941	0.150
试验23	3	2	1	3	2	1.470	2.428	0.965	0.941	0.150
试验24	3	2	1	3	3	1.470	2.408	0.989	0.938	0.150
试验25	3	3	2	1	1	1.441	2.484	1.839	0.950	0.150
试验26	3	3	2	1	2	1.454	2.420	2.200	0.941	0.147
试验27	3	3	2	1	3	1.443	2.442	2.223	0.943	0.144

参数	A	B	A×B	C	D
K₁	1.309	1.353	1.343	1.338	1.340
K₂	1.317	1.342	1.326	1.331	1.323
K₃	1.355	1.286	1.312	1.312	1.318
k₁	0.145	0.150	0.149	0.149	0.149
k₂	0.146	0.149	0.147	0.148	0.147
k₃	0.151	0.143	0.146	0.146	0.146
R	0.006	0.007	0.003	0.003	0.003
影响显著性	B>A>(A×B)=C=D