Guanhua QIAN, Ya'nan ZHAO, Xu WANG, Tao YU. Two-phase flow instability in multi-parallel channels of helical-coiled once-through steam generator[J]. NUCLEAR TECHNIQUES, 2025, 48(2): 020601
- NUCLEAR TECHNIQUES
- Vol. 48, Issue 2, 020601 (2025)
Fig. 1. Structure diagram of the H-OTSG
Fig. 2. Nodalization scheme for RELAP5
Fig. 3. Variations of the mass flow heating section with time at inlet (a) and outlet (b)
Fig. 4. The oscillation pattern of working condition parameters with flow instability (color online)(a) Pressure drop, (b) Mass flow, (c) Temperature
Fig. 5. The phase shift of G-ΔP in each channel (color online) (a) Channel 1, (b) Channel 2~13, (c) Channel 14
Fig. 6. The limit cycles of G-ΔP in each channel (a) Channel 1, (b) Channel 2⁓13, (c) Channel 14
Fig. 7. The flow regime of channel in channel 1 (color online)
Fig. 8. Comparison of oscillation curves with different inlet throttling (color online)(a) Rin=1 100，(b) Rin=1 300，(c) Rin=1 500，(d) Rin=1 700
Fig. 9. Influence of inlet throttling on stability boundary
Fig. 10. Comparison of oscillation curves with different outlet throttling (color online)(a) Rout=50, (b) Rout=100, (c) Rout=150, (d) Rout=200
Fig. 11. Influence of outlet throttling on stability boundary
Fig. 12. Comparison of oscillation curves under different system pressure (a) P=3.7 MPa, (b) P=3.9 MPa, (c) P=4.2 MPa, (d) P=4.4 MPa
Fig. 13. Influence of system pressure on stability boundary
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Table 1. Specific design parameters of the H-OTSG
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Table 2. The result of steady state calculation
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Table 3. Flow regime letters and numbers (Volume)
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