This standard specifies the symbols of common terms for turbines, pump turbines and storage pumps. This standard is applicable to the compilation of standards, technical documents, scientific articles and books. JB/T 6478-1992 Symbols for turbines, pump turbines and storage pumps JB/T6478-1992 Standard download decompression password: www.bzxz.net

Mechanical Industry Standard of the People's Republic of China
Symbols for turbines, pump-turbines and storage pumps Subject content and scope of application
This standard specifies the symbols of common terms for turbines, pump-turbines and storage pumps. This standard is applicable to the compilation of standards, technical documents, scientific and technological articles and books and periodicals. Reference standards
GB2900.45
Electrical terminology
Turbines, turbines and storage pumps
Terminology
General terms
Flow area
Turbine (ticket) inlet (outlet) area
Turbine (pump) outlet (inlet) area
Total specific energy change
Euler number
Specific pressure energy||tt| |Specific kinetic energy
Specific potential energy
Froude number
Acceleration due to gravity
Reynolds number
Struha number
Specific gravity of water
Apparent specific gravity of water
Relative density
Dynamic viscosity
Remote dynamic viscosity
Density of water
Approved by the Ministry of Machinery and Electronics Industry on August 6, 1992
3. 2. 1.1
3. 2. 1.17
JB/T647892
Terms and terms
Density of air
Performance parameters
Head (lift)
Head, full lift
Static head (lift)
Maximum head (lift)
Minimum head (lift)
Net head (turbine)
Design head (lift)
Static suction of turbine (pump) (person) height
Total head (lift)
Weighted average head
Pump zero flow headbzxZ.net
Environmental pressure head
Head (lift) loss
Turbine (pump) suction (person)
Pressure head (lift)
Velocity head (lift)
Vaporization pressure head
Position head (lift)
Implemented on 1993-01-01
3. 2. 1. 18
3. 2. 1.19
3. 2.1.20
3. 2. 2. 3
3. 2. 2. 4
3.2. 2. 5
3. 2.2. 8
2.3. 2
3. 2.3. 6
3. 2. 3. 7
3. 2. 3. 8
5. 2. 3. 9
3. 2.3.10
JB/T6478--92
Terms and terms
Sangjing suction head
Allowable minimum water level
Flow and speed
Turbine (pump) flow
Exponential flow
Maximum flow
Minimum flow
Design flow
Relative flow of index test
Turbine no-load flow
Unit flow
Water leakage
Circumferential speed
Average speed
Volute inlet flow velocity||tt ||Axial velocity
Radial component of velocity
Circumferential component of velocity
Axial component of velocity
Relative velocity
Discharge coefficient
Angular velocity
Critical speed
Highest speed of the system
Lowest speed of the system
(Pump) flow rate specific speed
Steady-state runaway speed of turbine, steady-state reverse runaway speed of pump (pump condition of pump-turbine)
Maximum steady-state runaway speed
Unit runaway speed
Rated speed
Specific speed
3. 2. 4.1
3. 2. 4. 2
3. 2. 4. 4
3. 2. 4. 5
3. 2.4. 6
3.2. 4. 8
Terms
Turbine no-load speed
Unit speed
Turbine output power, input power
Output power measured at the generator end
Input power measured at the generator end
Turbine input power, pump output power
Mechanical loss power
Turbine (pump) maximum output (input) power
Turbine (pump) minimum output (input) power
Turbine (pump) rated output (input) power
Pump zero flow input power
Unit power||tt ||Loss coefficient
Arithmetic mean efficiency
Hydraulic efficiency
Model efficiency
Mechanical efficiency
Optimum efficiency
Prototype efficiency
Integral mean efficiency
Design efficiency
Relative efficiency
Energy recovery coefficient of tail tube
Volume efficiency
Weighted mean efficiency
Cavitation safety factor
Cavitation coefficient
Critical cavitation coefficient
Model cavitation coefficient
Power station cavitation coefficient
Flow channel parameters
3. 3. 5-1
JB/T 6478-92
Terms
Runner (impeller) blade opening
Guide vane opening
Double-stroke turbine runner length
Elbow tailwater pipe outlet width
Guide vane height
Guide vane relative height
Turbine runner diameter, ticket impeller diameter
Seat ring inner diameter
Seat ring outer diameter, bulb body diameter
Bubble body ratio
Model runner diameter
Prototype runner diameter
Turbine tailwater pipe inlet diameter||tt| |Guide vane distribution circle diameter
Runner inlet diameter, impeller outlet diameter
Runner outlet diameter, impeller inlet diameter
Runner body diameter
Wheel-to-impeller ratio
Nozzle orifice diameter
Jet diameter
Voltage constant, water thrust coefficient
Length from unit center to tailwater pipe outlet
Chord length
Relative eccentricity of guide vane
Runner (impeller) blade inlet and outlet pitch
Voltage inlet section radius
Needle stroke
3. 4. 1. 3
3. 4.1. 4
3. 4.1. 6
3. 4. 1.10
3. 4.1.11
3. 4. 1.12
3. 4. 2.2
Depth of straight taper tailwater pipe, length of straight taper tailwater pipe3.4.2.5Pitch
Maximum width of inner surface of bucket
Number of guide vanes
Runner (impeller>number of blades + number of buckets
Angle of absolute speed and circumferential speed, guide vane opening3.53.5.1
Volute inlet velocity coefficient
Guide vane outlet angle
Terms and terms
Angle between circumferential velocity and relative velocity
Blade placement angle
Volute water flow angle, angle of attack, blade thickness
Guide vane eccentricity
Blade wrap angle
Volute radius
Volute wrap angle, runner (impeller) blade rotation angle force properties
Action force
Relative value of double amplitude
Hydraulic torque coefficient
Drag coefficient
Lift coefficient
Servomotor action
Hydraulic thrust
Unit water thrust
Hydraulic torque
Unit water torque
Absolute pressure force
ambient pressure
gauge pressure
initial pressure
vaporization pressure
hydrostatic pressure
turbine (pump) inlet (outlet) pressure
turbine (pump) outlet (inlet) pressure
gauge elevation
head measurement relative error
subscript code
additional instructions:
JB/T6478—92
terms
speed measurement relative error
flow measurement relative error
power measurement relative error
random error
system error
torque measurement relative error
efficiency relative error
cavitation coefficient relative error Error
Standard error
Regulation guarantee
Pressure wave propagation speed
Final speed
Initial speed
Turbine decomposition speed
Turbine (pump) inlet (outlet)
Turbine (pump) inlet (inlet)
Absolute
Environmental
Critical
Hydraulic
Mechanical
Maximum
Minimum
Model
Optimum
Prototype, pump-turbine pump operating conditions
Rated, designed
Relative
Specified
Turbine operating conditions of pump-turbine
This standard is provided by the Mechanical The Tianjin Electric Drive Design Institute of the Ministry of Electronics Industry proposed and coordinated this standard. This standard was drafted by the Tianjin Electric Drive Design Institute. The main drafters of this standard are An Liran and Wang Xiuli. 860
Terms and terms
Maximum transient overspeed of turbine
Final pressure
Maximum transient pressure of turbine
Unit feedback time constant
Shortest closing time of relay
Shortest opening time of relay
Relay stationary time
Pipeline reflection time
Guide vane closing time
Water flow inertia time constant
Maximum transient speed change rate
Permanent slip rate
Servomotor stroke
Maximum decompression pressure change rate of turbine
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