CB/Z 217-1987 Method for estimating the deep-water resistance of submarines CB/Z217-1987 standard download decompression password: www.bzxz.net

CBL 217-1987 Method of Assessing the Naked Hull Resistance of Submarines in Deep Water 2023-10-03
China State Shipbuilding Corporation Guiding Technical Document CBIZ
217-87
2001-August 248
Method of Assessing the Naked
of Submarines in
Resistance
Deep Water
Published in 1987
China Ship and Mail Corporation
China State Shipbuilding Corporation Guiding Technical Document Method of Assessing the Naked Hull Resistance of Submarines
in Deep Water Water
Group: Ship Theory and Experiment Professional Group
Hull length
Hull width
Hull diameter
Hull bow inflow section length
Hull parallel mid-body length
Hull outflow section length
Hull maximum cross-sectional area
Hull naked underwater longitudinal prism coefficient
Hull aspect ratio
Hull aspect ratio| |tt||Hull tail coefficient
Hull bow coefficient
Nude wet area when fully submerged
Total wet area of ​​actual boat when fully submerged
Sum of wet areas of all appendages when fully submerged
Wet area of ​​pressure command platform enclosure when fully submerged
Nude displacement volume when fully submerged
Total smooth nude resistance
Approved and issued by China State Shipbuilding Corporation in 1987
CBIZ 217-87
Smooth body friction resistance
Smooth body shape resistance
Smooth body viscous resistance
Sum of all appendages and protruding body resistance
Conning tower shell resistance
Total hull resistance
Drag increase from ship model to actual ship
Total hull resistance coefficient
Smooth body total resistance coefficient
Smooth body friction resistance coefficient
Smooth body shape resistance coefficient
Smooth body viscous resistance coefficient
Sum of all appendages and protruding body resistance coefficientConning tower hull resistance coefficient
Resistance conversion correction factor
Shape factor
Hull speed
Shape resistance influence coefficient
Shape factor influence coefficient|| tt||Viscous drag influence coefficient
Effective power of the hull when sailing in deep water
Froude number
Reynolds number
Tail angle
CBI/Z217-87
Kinematic viscosity coefficient
Resistance distribution of a real boat when sailing in deep water
The total resistance of a real boat when sailing in deep water can be written as RT-RTO+ERAP+RTW+RA
In the formula, R is equal to R in this navigation state and is the sum of them, that is, RTO-Ry=R+RfOn
The total resistance coefficient of a real boat when sailing in deep water is correspondingly CT=CTO+CAP+CTW+CA
CTO=CC+COn
The resistance coefficient C is defined as
CR/+VS
In the formula, R is the resistance.
The characteristic area S corresponding to each resistance coefficient is the total wet area of ​​the actual boat. 2.4
Estimation method of deep-water resistance of actual boat
The total resistance coefficient of smooth and naked deep-water boat can be written in the following three forms: 3.1
CTo=CF+Cron
CTO=（I+K)CF
In the formula. k is the shape factor, defined as
C(Rn)-CF(Rn)
CF(Rn）
2217-87
This technical document is in the above three forms. Three types of graphs for calculation are provided respectively. The friction resistance coefficient C appearing in the graph is calculated according to the TTC-5 formula, that is, CF
The resistance coefficient of smooth and naked boat CT. Determination of 0·075
(1 name Rn—2)2
According to the conventional method, the total resistance coefficient of naked deep water is determined as follows: 3.4.1
According to the parameters of the new design boat / D (or L/B), Cp, refer to Figure 1 to obtain Cn=f(L/D, Cp)
According to the new design boat end coefficient LR/AM, refer to Figure 2 to obtain b
nfon=f2（LR/
Shape resistance coefficient
Cfonnfonxci|| tt||d Total resistance coefficient of smooth naked deep water
ＣＴｏ=ＣｆｏＣｒ
Use shape factor method to determine the total resistance coefficient of naked deep water, the steps are: 34:2
According to the new design boat parameters L/D (or I/B), Cp, refer to Figure 3 to get =f(L/D, C)
bAccording to the new design boat tail coefficient LR//A, refer to Figure 4 to get n=F4(LR/AM
: Total resistance coefficient of smooth naked boat in deep water
C=C=(1 +n×)×CF
3·4.3 Directly estimate the total deep-water resistance coefficient of the smooth naked boat, the steps are: According to the new design boat parameters (L/D or I/B), P, Rn, look up a set of graphs (Figures 5 to 8) to obtain V=f5(L/D, CP, Rn)
According to the tail coefficient of the new design boat LR
CB/Z217-87
AM, look up Figure 9 to obtain
V=f6（LR)
c Total deep-water resistance coefficient of the smooth naked boat|| tt||=nyxc!
When converting the resistance from the atlas to the new design of the actual boat, the resistance conversion correction coefficient CA is selected as CA=(1.4～1·5)×10-3
3·6 Three methods can be used to verify the results. Method 3·4·1 has a slightly lower guess, while methods 3·4·2 and 3.4·3 have higher accuracy.
3·7 The above three methods can be selected according to the user's habits. The C value is only applicable to the estimation of this atlas. Method for estimating the naked wet area of ​​an actual boat
This chart uses the following approximate formula to calculate the actual submarine naked wet area So=(a+bxL/D+cxcp
where a, b, c are coefficients, and their values ​​are selected according to the following table. Submarine type
Pure conventional line type
Transitional line type
Revolving body type
Estimation procedure for effective power of submarine during deep water navigation b
0.32bzxZ.net
Because there are three methods for estimating the smooth naked resistance, the estimation of effective power is also There are three methods. The conversion procedure is shown in Appendix 1.2.3.
Scope of application
6·1 This chart is applicable to transitional line type and rotating body type high-speed submarines (Fn>0·3). For pure conventional line type and low-speed deep-diving submarines, if the main scale coefficient is within the range of 6·2, it can also be used as a reference. 6:2 Main scale and coefficient range
L/D (or L/B)
This chart is applicable to the scheme design and preliminary design stages. Table 1
Actual boat speed
Actual Boat speed
Reynolds number
Friction resistance coefficient
217-87
Procedure for estimating the effective power of a real boat in deep water according to the 34·1 method
According to the design boat's engineer/D, C, refer to Figure 1 to determine
's smooth naked shape resistance coefficient
According to the design boat's tail coefficient LR/AM, refer to Figure
2 to obtain the shape resistance influence coefficient
The smooth naked shape resistance coefficient of the real boat
The total appendage resistance coefficient Sum of numbers
Command and enclosure resistance coefficient
Resistance conversion correction factor
Total resistance coefficient of actual boat
Nude wet area of ​​actual boat when fully submerged
Sum of wet areas of all appendages and command platform enclosure Total wet area of ​​actual boat when fully submerged
Total resistance of actual boat when sailing in deep water
Symbols and formulas
(m/s)2
Cp(Rn)=0.075/(1gRn-2)2
Cfon=n fonxc'fon
Cr=(5)+(8)+(9)+(10)+(11)
8nh=(a+bxXI/D+CXCp)xv
ESAp+Sfw
S=(13)+(14)
p×(3)×(5)
RT=(12)x(16)x9.8
CB/Z 217-87
Effective power of actual boat during deep water navigation
Actual boat speed
Actual boat speed
Reynolds number
Symbols and formula
PE=(17)×(2)
(17)x(2)
Procedure for estimating effective power of actual boat during deep water navigation according to 3.4·2 method
Friction resistance coefficient
Shape factor determined by looking up Figure 3 based on L/D and C of designed boat
Shape factor influence coefficient determined by looking up Figure 4 based on tail coefficient LR//AM of designed boat|| tt||Smooth naked viscous drag coefficient of actual boat
Sum of drag coefficients of all appendages
Drag coefficient of conning tower shell
Drag conversion correction factor
Total drag coefficient of actual boat
Nude wet area of ​​actual boat when fully submerged
Sum of wet areas of all appendages and conning tower shell V2
Symbols and formula
Horsepower）
(m/s)2
C(Rn)=0.075/(1gRn-2)2
C=(1+nX)CF
CT= (8)+(9)+(1@)+(11)
Snh=(a+bxL/D+cxcg)xV
ZSAP+STW
Total wetted area when the boat is fully submerged
Total resistance when the boat is sailing in deep water
Effective power when the boat is sailing in deep water
217-87
Symbols and formulas
S=(13)+14)
p×(3)×(15)
R/(12)x(16)x98
PE= (17)×(2)
(17)x(2)
735·5
Procedure items for estimating the effective power of a real boat when sailing in deep water according to the 3·4:3 method
Real boat speed
Reynolds number
According to the designed boat L/D and CpRn, refer to Figures 5, 6, 7, and 8 to determine the viscous drag coefficient of the smooth naked boat. According to the designed boat tail coefficient LB//AM, refer to Figure 9 to determine the viscous drag influence coefficient
Real boat smooth naked viscous drag coefficient
Total appendage drag Sum of force coefficients
Drag coefficient of conning tower
Drag conversion correction factor
Total drag coefficient of actual boat
Symbols and formula
Horsepower）
C=nyXCIV
CT=(7)+(8)+(9)+(10)
Nude wet area of ​​actual boat when fully submerged
217-87
Symbols and formula
sn=(a+bXL/D+cxcCp)xv
Wet surface of all appendages and conning tower The sum of the products is the total wet area of ​​the actual boat when fully submerged
Total resistance of the actual boat when sailing in deep water
Effective power of the actual boat when sailing in deep water
ZSAP+SfW
S=(12)+(13)
+p×(3)×(14)
R=(11)x(15)x9·8
Pe=(16)X(2)
(16)×（2)
735·5
Horsepower）
CB/Z217-87
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18~0-5
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