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Модель расчетного обоснования регулирования расхода в каскаде насосных станций путем дросселирования напора..pdf

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05.23.00 яРПНХРЕКЭЯРБН Х ЮПУХРЕЙРСПЮ
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лндекэ пюявермнцн нанямнбюмхъ
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╧ 1? 2017
опхпндннасярпниярбн
????? ????????? (7), ???????
Q? =
S1 + S12 ? (S ??1 + S ?? 2 + S gp1 + S gp1 ? S 2 )? ( ? ? ? 2S 0 )
S ??1 + S ?? 2 + S gp1 + S gp1 ? S 2
(8)
.
??? ????????? ???????? ???????????? ??????? (Sgp1 ? Sgp2 = 0) ??????
? ??????? ???????? ??????? ???????????
?? ???????:
Q? 0 =
???. ????? ???????????????? ???????
???????? ???????
??? ????????????? ???????
???????? ????????? ????????? ??????? ??????? ? ??????? ?? 2-? ?? ??? ?????????????? ???????? ? ????? ???????????? ????????????? ???????????? ?? ?????? ??????? ??????? (???. 1):
. (9)
??? ????????????? ??????? ? ??????? ?????????? ??????. ?????????? ???
??????.
1. ?????? ???????????? ???????????
??????????? ?? ?????? ??????? ???????.
??????????? ?????????? ?? ?????? ???????
????????? ? ???????? ?????????. ??? ????
????? ??????? Sgp2 = 0.
?? ????????? (1?6) ?????
? ?? 2 =
? ? S ?? 2 ? S ??1 ? S gp1 2
+
? Q? ,
2
2
(10)
(1)
H ? 2 = H ?? 2 ? H ?? 2 ,
(2)
??? ???2 ? ????? ?? ??????????? ???????? ?????? ?????? ???????.
H ? 2 = H ? + S ?? 2 ? Q?2 ,
(3)
H ?1 = H ?? 2 + S ??1 ? Q?2 ,
(4)
?? ????????? (10) ???????, ??? ??? ????????? ???????? ?????????????? ?????????? (Sgp1 = 0)
H ? 1 = H ?1 + S gp1 ? Q?2 ,
(5)
H ? 2 = H ?? 2 ? S gp 2 ? Q?2 ,
(6)
???????? ?? ????????? (1?6) ??? ??????????, ????? Q?, ??????? ?????????
?????????:
??1
S ??1 + S ?? 2 ? S 2
H ? = H ?1 = H ? 2 = S0 + S1 ? Q? + S 2 ? Q?2 ,
??? ??1 ? ??2 ? ?????? ??????? ?? ??-1 ? ??-2; ???2
? ???2 ? ????? ? ???????? ? ??????????? ?????????
?????? 2-? ???????, ?; ?? ? ????????????? ?????, ?;
??1, 2 ? ????? ? ?????? ????????????? 1-? ? 2-? ????????, ?; Sg?1, 2 ????????????? ?????????????? ????????????? ??????????? ???????????? ?????????, ????????? ?? ????????? ???????????? ??????? ?2/?5;
S0, S1, S1 ? ???????????? ???????????? [2]; Q? ? ?????? ??????, ?3/?.
(S
S1 + S12 ? ( S ??1 + S ?? 2 ? S 2 )? ( ? ? ? 2S 0 )
+ S ?? 2 + S gp1 + S gp1 ? S 2 )? Q?2 ? 2S1Q? + ? ? ? 2 S0 = 0. (7)
?? ????????? (7) ???????, ??? ??????
? ??????? ?? ??????? ?? ????? ????????????? ?????????????? ????????????? ??????????? ???????????? ????????? (Sgp1 +
Sgp2), ?.?. ?????? ????? ???????????? ?????
?? ???? ??????????? ????????? ???? ??????
????????????.
╧ 1? 2017
? ?? 2 =
? ? S ?? 2 ? S ??1 2
+
? Q? .
2
2
(11)
? ???????????? ?????????????? ?????
(S??1 = S??2),
???2 = ??/2, Sgp1 = 0
? ?? 2 =
? ? S gp1 2
+
? Q? ??? Sgp1 > 0
2
2
????? ???????, ? ???????????? ?????????????? ????? ???????? ??????????????? ?????? ?? ?????? ??????? ?????????
?????? ???? ? ??????? ? ????? ?? ??????????? ????????? ??????? ?????? ???????
?? ???????? ???????? ?????? ? ?????????????? ?????? [3].
???? S??1 ? S??2, ?? ????????? ??????
?? ??????????? ????????? ??????? ??????
??????? ? ?????????? ?????????? ???????? ??????????????? ?????????? ??????????? ?? ???????:
?? ?? 2 = ? ?? 2.0 ? ? ?? 2 =
S gp1 2
S ?? 2 ? S ??1
? (Q?20 ? Q?2 ) +
? Q? , (12)
2
2
??? ???2 ? Q?? ? ????? ? ?????? ??? Sgp1 > 0.
?? ????????? (12) ???????, ??? ? ?????????????? ????? ?????????? ??????
63
05.23.00 яРПНХРЕКЭЯРБН Х ЮПУХРЕЙРСПЮ
?? ??????????? ????????? ??????? ??????
??????? ?????????? ?? ???????? ????????
?????????????? ?????? ? ??????????????
?????????? ?? ????????
?? ??` 2 =
S ?? 2 ? S ??1
? (Q?20 ? Q?2 ).
2
(13)
2. ?????? ???????????? ???????????
??????????? ?? ?????? ???????. ? ???? ?????? Sgp1 = 0.
?? ????????? (1?6) ?????:
? ?? 2 =
? ? S ?? 2 ? S ??1 + S gp 2
+
?Q?2 .
2
2
(14)
? ???????????? ????? (S??1 = S??2)
?????:
? ?? 2 =
? ? S gp 2
+
?Q?2 .
2
2
(15)
????? ???????, ? ???????????? ?????????????? ????? ???????? ??????????????? ?????? ?? ?????? ??????? ????????? ????? ?? ??????????? ????????? ?????? ??????? ?? ???????? ???????? ??????
? ?????????????? ??????????.
? ?????????????? ????? ??? ????????? ???????? ?????????????? ??????
(Sgp2 ? 0)
? ?? 2.0
?
S ?S
= ? + ?? 2 ??1 ?Q?20 .
2
2
(16)
??????? ?? ????????? (16) ?????????
(14), ???????
?? ?? 2 = ? ?? 2.0 ? ? ?? 2 =
S gp 2 2
S ?? 2 ? S ??1
? (Q?20 ? Q?2 ) ?
? Q? . (17)
2
2
?? ????????? (17) ???????, ??? ? ?????????????? ????? ?????????? ?????? ?? ??????????? ????????? ?????? ??????? ?????????? ?? ???????? ???????? ?????????????? ?????? ? ?????????????? ??????????
`
?? ???????? ?? ??
2.
??????
1. ??? ???????? ??????????????? ?????? ?? ?????? ??????? ????? ?? ??????????? ????????? ??????? ?????? ???????
???????????, ? ??? ???????? ??????????????? ?????? ?? ?????? ??????? ? ????????????? ?? ????????, ?????? ???????? ??????
?????? ?????????????? ??????????.
2. ? ???????? ??????????????? ?????????? ????? ???????????? ???????? ???????? ??????? ? ????????? ????? ? ????????
???????? ????????? ????????. ??????????? ???????????? ????????????? ??????
???????? ?????????????? ?????? ???????,
????????????? ?? ??????????? ?????????????? ?????? ? ??????????? ????????.
????????????????? ??????
1. ???????? ?.?. ????????? ?????????? ? ????????????? ?????? ???????? ???????????? ??????. ? ?.: ????, 1996. ? 140 ?.
2. ??????????? ?.?.
?????????????
???????? ????????????? ?????????????
??????? ??????? // ???????????? ????????
??????????. ? 2013. ? ? 1 (71). ? ?. 51-57.
3. ???????? ?.?. ?????????????? ????????????? ?????????????. ? ?.: ?????,
1982. ? 224 ?.
???????? ???????? ? ???????? 02.11.2016 ?.
???????? ?? ???????
??? ?????? ????????, ???????? ??????????? ????, ?????? ??????? ????????????????????? ????????????? ? ?????????????; ????? ?? ????-???? ????? ?.?. ??????????;
127550, ??????, ??. ?????????????, 49; ???.:
8-499-391-12-07; ?-mail: munzer@yandex.ru
???????? ????? ?????????, ??????
??????????? ????, ????????? ??????? ????????????????????? ????????????? ? ?????????????; ????? ?? ????-???? ?????
?.?. ??????????; 127550, ??????, ??. ?????????????, 49; ???.: 8-499-976-11-85.
ALI MUNZER SULEIMAN, D.S. BEGLYAROV
Federal state budget educational institution of higher education ╚Russian steta agrarian university ?
?A? named after C.A. Timiryazev╩, Moscow
MODEL OF CALCULATION SUBSTANTIATION
OF FLOW CONTROL IN A CASCADE OF PUMPING STATIONS
BY THROTTLING PRESSURE
The article describes the developed method of calculation and an algorithm allowing
carrying out calculations on flow control in a cascade of pumping stations by throttling pressure.
The operating experience of pumping stations shows [1] that major damages and accidents
of pump aggregates happen during transient processes, start-up and stops which in accordance
64
╧ 1? 2017
опхпндннасярпниярбн
with the work schedule can be assigned several times a day, as well as under emergency shutdown
of electric engines from the power system. Therefore, when designing pumping stations it is
necessary to comprehensively take into account the work of the pressure tract and technological
equipment and to assign schemes and structures on the basis of calculations and analysis
of transient processes with an allowance to static and dynamic characteristics of pumps
and electric motors. The aim of investigations is developing recommendations for designing
cascades of irrigation pumping stations operating in series without an intermediate capacity
which relate to the definition of parameters of the pressure system and shockproof devices. To
achieve this aim it is necessary to solve the problem of flow control in the cascade by throttling
pressure.
?ascade of pumping stations, pressure, flow, hydraulic resistance coefficient, throttle
adjusting devices, transient processes.
Reference
1. Beglyarov D.S. Povyshenie nadezhnosti I effectivnosti raboty zakrytyh orositeljnyh
system. ? ?.: ?GUP, 1996. ? 140 s.
2. Podvolotskij N.M. Analitichskoe opisanie
universaljnyh haracteristik sudovyh nasosov // Ezpluatatsiya morskogo transporta. ?
2013. ? ? 1 (71). ? S. 51-57.
3. Aljtshul A.D. Gidravlicheskie soprotivleniya truboprovodov. ? ?.: Nedra, 1982. ? 224 s.
The material was received at the editorial office
02.11.2016
╧ 1? 2017
Information about the authors
Ali Munzer Suleiman, candidate of
technical sciences, associate professor of
the chair of agricultural water supply and
drainage FSBEI HE RSAU-MAA named
after C.A. Timiryazev; 127550, Moscow,
ul. Timiryazeva, 49; tel.: 8-499-391-12-07;
?-mail: munzer@yandex.ru
Beglyarov David Surenovich, doctor of
technical sciences, professor of the chair of agricultural water supply and drainage FSBEI
HE RSAU-MAA named after C.A. Timiryazev;
127550, Moscow, ul. Timiryazeva, 49; tel.:
8-499-976-11-85.
65
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