Fig.1

Turbine structure diagram

Fig.2

Structure diagram of water pressure chamber

Table 1

Relationship between placement angle of tongue and specific speed

Table 2

Main parameters of turbine and water pressure chamber

Fig.3

Grid division

Fig.4

Grid independence verification

Fig.5

Entropy yield distribution of supercharging system

Table 3

Entropy production ratio of each part of supercharging system

Fig.6

Distribution of entropy yield of different water pressure chambers

Fig.7

Distribution of entropy yield at 8 sections of different water pressure chambers

Fig.8

Velocity cloud images of different water pressure chambers

Fig.9

Entropy production and pressurization values of different water pressure chambers

Fig.10

Section shapes of different pressure chambers

Fig.11

Distribution of entropy yield at 8 sections of different section shape water pressure chambers

Fig.12

Entropy production and pressurization values of different section shape water pressure chambers

Fig.13

Entropy yield distribution of water pressure chamber at 8 sections with different inlet widths

Fig.14

Entropy production and pressurization values of water pressure chamber at different inlet widths

Fig.15

Variation of section area

Fig.16

Entropy yield cloud diagram of water pressure chamber with different cross-section area change laws

Fig.17

Entropy production and pressurization values of different water pressure chamber with different cross-section area change laws

Fig.18

Entropy yield distribution of turbines in different blade forms

Fig.19

Distribution of entropy yield in pressurized water chamber with different blade forms

Fig.20

Entropy production and pressurization values of turbines in different blade forms

Fig.21

Distribution of entropy yield of water pressure chamber before and after optimization

Fig.22

Entropy production and pressurization values of water pressure chamber before and after optimization

Fig.23

Physical picture of impeller with different blade forms

Fig.24

Test system diagram

Fig.25

Installation diagram of pressure acquisition sensor at outlet of booster system

Table 4

Piston pump parameters

Fig.26

Turbocharging effect comparison of twisted blades at different rotate speeds

Fig.27

Test value comparison for turbocharging effect of straight blade and twisted blade