Hydrogen supply system for turbine engine and device for regulating such hydrogen supply system

Abstract

The invention relates to a device (B) for regulating a hydrogen supply system (A) of a turbine engine comprising a combustion chamber, comprising at least, in particular in series, a pressurizing member (2), and a metering member (5) advantageously connected to the combustion chamber, characterised in that the regulating device further comprises: a hydrogen reservoir (4) arranged in the pressurizing member (2); a hydrogen reservoir (4) arranged between the pressurizing member (2) and the metering member (5),-a first regulator (21) capable of controlling the pressurizing member (2) as a function of the hydrogen pressure in the hydrogen reservoir (4) and a hydrogen pressure setpoint in the hydrogen reservoir (4), and-a second regulator (31) capable of controlling the pressurizing member (2) as a function of the hydrogen pressure setpoint in the hydrogen reservoir (4), the second regulator is capable of controlling the metering member (5) as a function of the hydrogen flow injected into the combustion chamber and the hydrogen flow setpoint (CQ) to be injected into the combustion chamber.

Description

Field of the Invention

[0001] The present invention generally relates to a hydrogen supply system for a turbine engine (e.g., an aircraft engine) using hydrogen as fuel. More particularly, the present invention relates to a device for regulating the hydrogen supply system of such a turbine engine. Background Art

[0002] The function of a hydrogen supply system for a turbine engine (more particularly, an aircraft engine) is to supply a controlled hydrogen flow rate to an injector located in the combustion chamber of the turbine engine.

[0003] The hydrogen supply system of a turbine engine includes, in series from upstream to downstream along the flow direction of hydrogen:

[0004] - a liquid hydrogen tank,

[0005] - a liquid hydrogen pressurizing member,

[0006] - a heating member for raising the temperature of the liquid hydrogen so that the liquid hydrogen can evaporate into gaseous hydrogen,

[0007] - a metering member for metering the mass flow rate of the gaseous hydrogen at the input of the combustion chamber, and

[0008] - a shut-off valve.

[0009] The shut-off valve is connected to a supply line that is connected to the injector of the turbine engine.

[0010] In order to accurately meter the hydrogen flow rate injected into the combustion chamber of the turbine engine, it is necessary to determine the law for regulating the hydrogen supply system of the turbine engine. This includes a system of the "multiple input, single output" type, also known as MISO.

[0011] In addition, the law for regulating the system must particularly take into account the constraints associated with the need to ensure a high level of metering performance in terms of response time, accuracy, and robustness, while limiting the power requirements of the pressurizing member. Summary of the Invention

[0012] The present invention aims to solve the problems of the prior art by providing a regulating device for regulating the hydrogen supply system of a turbine engine including a combustion chamber, the hydrogen supply system including at least, in particular, arranged in series:

[0013] - a pressurizing member, and

[0014] - a metering member, advantageously, the metering member being connected to the combustion chamber,

[0015] Characterized in that the regulating device further includes:

[0016] - A hydrogen reservoir, the hydrogen reservoir being arranged between a pressurizing member and a metering member,

[0017] - A first regulator, the first regulator being capable of controlling the pressurizing member based on the hydrogen pressure in the hydrogen reservoir and a hydrogen pressure setpoint in the hydrogen reservoir, and

[0018] - A second regulator, the second regulator being capable of controlling the metering member based on the hydrogen flow rate injected into the combustion chamber and a hydrogen flow rate setpoint to be injected into the combustion chamber.

[0019] The hydrogen reservoir is used to separate the dynamics of the upstream part of the hydrogen supply system from the dynamics of the downstream part of the hydrogen supply system.

[0020] Thus, the respective control logics of the upstream part and the downstream part of the hydrogen supply system of the turbomachine can be separated.

[0021] According to a preferred feature, the first regulator controls the operation of the pressurizing member based on the difference between the hydrogen pressure in the hydrogen reservoir and the hydrogen pressure setpoint in the hydrogen reservoir.

[0022] According to a preferred feature, the second regulator controls the operation of the metering member based on the difference between the hydrogen flow rate injected into the combustion chamber and the hydrogen flow rate setpoint to be injected into the combustion chamber.

[0023] According to a preferred feature, the regulating device further includes a pressure setpoint processing circuit that is capable of determining the hydrogen pressure setpoint.

[0024] According to a preferred feature, the pressure setpoint processing circuit includes an input connected to the engine control device of the turbomachine and an output connected to a first subtractor for calculating the difference between the hydrogen pressure value and the hydrogen pressure setpoint.

[0025] According to a preferred feature, the pressure setpoint processing circuit includes a downstream pressure processing module that is capable of determining the hydrogen pressure downstream of the metering member.

[0026] According to a preferred feature, the downstream pressure processing module determines the hydrogen pressure downstream of the metering member based on the hydrogen flow rate value injected into the combustion chamber and the hydrogen pressure value in the combustion chamber.

[0027] According to a preferred feature, the pressure setpoint processing circuit includes a steady-state setpoint processing module that is capable of determining the steady-state hydrogen pressure setpoint in the hydrogen reservoir.

[0028] According to a preferred feature, the pressure setpoint processing circuit includes a phase-advance determination module that is capable of defining the compensation for the response time of the first regulator in transient conditions.

[0029] According to a preferred feature, the metering member performs sonic and / or subsonic metering as a function of a hydrogen pressure setpoint.

[0030] The invention also relates to a hydrogen supply system for a turbomachine, characterized in that the hydrogen supply system for the turbomachine comprises a regulating device as described above.

[0031] The invention also relates to a turbomachine comprising an injector, characterized in that the turbomachine comprises a hydrogen supply system as described above.

[0032] The invention also relates to an aircraft comprising a turbomachine as described above.

[0033] The hydrogen supply system for the turbomachine, the turbomachine and the aircraft have advantages similar to those described above. Description of the Drawings

[0034] Further features and advantages will become apparent on reading the following description of preferred embodiments, given by way of non-limiting example and with reference to the accompanying drawings, in which:

[0035] Figure 1 There is schematically shown a hydrogen supply system for a turbomachine according to an embodiment of the invention.

[0036] Figure 2 There is shown a graph representing the variation over time of the hydrogen flow rate at the output of a hydrogen storage tank of a hydrogen supply system according to the invention.

[0037] Figure 3 There is schematically shown a device for regulating a hydrogen supply system for a turbomachine according to an embodiment of the invention.

[0038] Figure 4 There is shown a hydrogen pressure setpoint processing circuit in a hydrogen storage tank of a hydrogen supply system according to the invention.

[0039] Figure 5 There is shown a graph representing the variation over time of the hydrogen pressure setpoint at the output of a hydrogen storage tank of a hydrogen supply system according to an embodiment of the invention.

[0040] Identical, similar or equivalent elements in the different figures have the same reference numerals in order to facilitate passing from one figure to another.

[0041] The different elements shown in the drawings are not necessarily shown to the same scale in order to make the drawings more legible.

[0042] The different possibilities (variations and embodiments) must be understood as not being mutually exclusive and may be combined with one another. Detailed Description

[0043] Figure 1 An embodiment of the hydrogen supply system A of the turbine engine according to the present invention is schematically shown, which can supply a controlled hydrogen flow rate to the injector 100 located in the combustion chamber of the turbine engine.

[0044] More specifically, the hydrogen supply system A includes a hydrogen tank 1 along the hydrogen flow direction from upstream to downstream. In particular, the hydrogen is in cryogenic liquid state, especially at a low pressure (for example, on the order of between 2 bar and 3 bar) and at a low temperature (for example, on the order of 10K).

[0045] The hydrogen tank 1 is connected to a pressurizing member 2, which is used to increase the pressure of hydrogen (especially liquid hydrogen). The hydrogen pressure is increased to keep the hydrogen pressure during injection greater than the pressure Pcc of the combustion chamber of the turbine engine.

[0046] Therefore, at a given injected hydrogen flow rate, the difference between the output pressure of the pressurizing member 2 and the pressure Pcc in the combustion chamber must be greater than the sum of the pressure losses of different equipment items of the hydrogen supply system A.

[0047] The pressurizing member 2 can be, for example, a pump, especially a centrifugal pump, or a plurality of pumps in series (especially a plurality of centrifugal pumps).

[0048] The pressurizing member 2 is connected to a heating member 3, which is used to increase the temperature of hydrogen (especially liquid hydrogen). This temperature increase enables the hydrogen entering the heating member 3 to evaporate into gaseous hydrogen while controlling the temperature range allowing hydrogen combustion.

[0049] The heating member 3 can be, for example, an electric exchanger or an exchanger with another heating fluid.

[0050] The heating member 3 is connected to a hydrogen reservoir 4, especially a reservoir for gaseous hydrogen, which is used to achieve a "buffering" function between the upstream part of the hydrogen supply system A arranged upstream of the hydrogen reservoir 4 and the downstream part of the hydrogen supply system A arranged downstream of the hydrogen reservoir 4.

[0051] The hydrogen reservoir 4 is connected to a metering member 5, which is used to meter the mass flow rate of hydrogen (especially gaseous hydrogen) at the input end of the combustion chamber.

[0052] The metering member 5 can be, for example, a variable cross-section metering valve or a regulator coupled to a sonic throat.

[0053] The metering member 5 is connected to a cut-off member 6, which is used to enable separation between the hydrogen supply system A and the combustion chamber of the turbine engine.

[0054] The cut-off member 6 can be, for example, an "on / off" type cut-off valve.

[0055] The cut-off member 6 is connected to a supply line which is connected to an injector 100 located in the combustion chamber of a turbine engine. The injector 100 and the combustion chamber are conventional and will not be described in detail here.

[0056] The hydrogen supply system A also includes a plurality of sensors. In particular, the hydrogen supply system A may include:

[0057] - a hydrogen temperature sensor 7, in particular, which is arranged upstream of the metering member 5, especially between the hydrogen reservoir 4 and the metering member 5;

[0058] - a hydrogen pressure sensor 8, in particular, which is arranged upstream of the metering member 5, especially between the hydrogen reservoir 4 and the metering member 5; and / or

[0059] - a hydrogen flow sensor 9, advantageously, which is positioned as close as possible to the injector 100 of the turbine engine, especially arranged downstream of the shut-off member 6.

[0060] The hydrogen flow sensor 9 is, for example, a mass flow meter or any other type of sensor, so as to enable obtaining information about the flow rate flowing in the hydrogen supply system A.

[0061] Therefore, the hydrogen flow sensor 9 enables measuring the hydrogen flow rate supplied to the injector 100.

[0062] According to a first variant, the metering member 5 operates according to the acoustic metering principle. In this case, if the relation is verified:

[0063]

[0064] where,

[0065] -P 上游 is the hydrogen pressure upstream of the metering member 5,

[0066] -P 下游 is the hydrogen pressure downstream of the metering member 5,

[0067] -γ is the adiabatic index of hydrogen,

[0068] then the flow rate downstream of the metering member 5 is given by relation (1):

[0069]

[0070] where,

[0071] -Q is the hydrogen flow rate through the metering member 5,

[0072] -S is the cross-section of the metering member 5,

[0073] -T 上游 is the hydrogen temperature upstream of the metering member 5, and

[0074] -r is the gas constant of hydrogen.

[0075] According to relation (1), the hydrogen flow rate Q metered by the metering member 5 depends on the change in the hydrogen temperature T upstream of the metering member 5 上游 in.

[0076] However, due to the slow temperature dynamic changes (especially those on the order of seconds) and the low impact (i.e., the square root as shown in relation (1)), the hydrogen temperature T upstream of the metering member 5 上游 is considered to be disturbing and is not considered as a control parameter of the hydrogen supply system A.

[0077] More specifically, the metering member 5 can be implemented according to two possibilities.

[0078] According to the first possibility, the metering member 5 is a variable cross-section valve. According to this configuration, in order to meter the hydrogen flow rate Q through the metering member 5, only the parameters related to the cross-section S of the metering member 5 and the hydrogen pressure P upstream of the metering member 5 in relation (1) 上游 change. Therefore,

[0079] - The cross-section S of the metering member 5 changes according to the command applied to the variable cross-section valve that is the metering member 5; and

[0080] - For example, by changing the rotational speed of the pump that is the pressurizing member 2, the hydrogen pressure P upstream of the variable cross-section valve that is the metering member 5 上游 changes according to the command applied to the pressurizing member 2.

[0081] According to the second possibility, the metering member 5 is a sonic throat with a pressure reducing valve. According to this configuration, in order to meter the hydrogen flow rate Q through the metering member 5, only the parameters related to the hydrogen pressure P upstream of the metering member 5 in relation (1) 上游 change. Therefore,

[0082] - The cross-section S of the metering member 5 is fixed because the sonic throat that is the metering member 5 has a fixed cross-section S;

[0083] - The pressure reducing valve of the metering member 5 adjusts the pressure difference ΔP pressure reducing valve, which corresponds to the hydrogen pressure P in the hydrogen storage 4 accu and the hydrogen pressure P upstream of the metering member 5 上游 specifically according to the command applied to the pressure reducing valve; and

[0084] - For example, by changing the rotational speed of the pump serving as the pressurizing member 2, the hydrogen pressure P in the hydrogen reservoir 4 accu varies according to the command applied to the pressurizing member 2, and this hydrogen pressure corresponds in particular to the pressure upstream of the pressure reducing valve.

[0085] Thus, the pressure difference ΔP 减压阀 = P accu - P 上游 is the head loss regulated by the pressure reducing valve of the metering member 5.

[0086] According to a second variant, the metering member 5 operates according to the subsonic metering principle. In this case, if the relation:

[0087]

[0088] is verified, the flow rate downstream of the metering member 5 is given by relation (1bis):

[0089]

[0090] More specifically, in a manner similar to that described above, the metering member 5 can be implemented according to two possibilities.

[0091] According to the first possibility, the metering member 5 is a variable cross-section valve. According to this configuration, in order to meter the hydrogen flow rate Q through the metering member 5, only the parameters in relation (1bis) that are related to the cross-section S of the metering member 5, the hydrogen pressure P 上游 upstream of the metering member 5, and the hydrogen pressure P 下游 downstream of the metering member 5 change. Thus,

[0092] - The cross-section S of the metering member 5 changes according to the command applied to the variable cross-section valve serving as the metering member 5;

[0093] - For example, by changing the rotational speed of the pump serving as the pressurizing member 2, the hydrogen pressure P 上游 upstream of the variable cross-section valve serving as the metering member 5 changes according to the command applied to the pressurizing member 2.

[0094] - For example, by changing the rotational speed of the high-pressure compressor, the hydrogen pressure P 下游 downstream of the variable cross-section valve changes according to the change in the pressure Pcc in the combustion chamber.

[0095] According to the second possibility, the metering member 5 is a subsonic throat with a pressure reducing valve. According to this configuration, in order to meter the hydrogen flow rate Q through the metering member 5, only the parameters P 上游 and P 下游 in formula (1bis) change. Thus,

[0096] The cross-section S of the metering member 5 is fixed because the subsonic throat of the metering member 5 has a fixed cross-section S;

[0097] - The pressure reducing valve of the metering member 5 adjusts the pressure difference ΔP, in particular according to a command applied to the pressure reducing valve 减压阀 , which pressure difference corresponds to the hydrogen pressure P in the hydrogen reservoir 4 accu and the hydrogen pressure P upstream of the metering member 5 上游 ;

[0098] - For example, by changing the rotational speed of the pump serving as the pressurizing member 2, the hydrogen pressure P in the hydrogen reservoir 4 accu varies according to a command applied to the pressurizing member 2; and

[0099] - For example, by changing the rotational speed of the high-pressure compressor of the turbine engine, the hydrogen pressure P downstream of the metering member 5 with a fixed cross-section 下游 varies according to the change in the pressure Pcc in the combustion chamber.

[0100] Therefore, ΔP 减压阀 = P accu - P 上游 is the head loss adjusted by the pressure reducing valve of the metering member 5.

[0101] The hydrogen supply system A of the turbine engine includes an upstream portion of the hydrogen supply system A located upstream of the hydrogen reservoir 4 and a downstream portion of the hydrogen supply system A located downstream of the hydrogen reservoir 4.

[0102] The upstream portion of the hydrogen supply system A includes a pressurizing member 2 and a heating member 3, which heating member serves as a member for evaporating hydrogen (in particular liquid hydrogen).

[0103] The downstream portion of the hydrogen supply system A includes a metering member 5 and a cut-off member 6.

[0104] Figure 2 A graph showing the variation of the hydrogen flow rate over time at the output of the hydrogen reservoir 4 of the hydrogen supply system A according to the present invention is shown.

[0105] More specifically, Figure 2 the graph shows the variation over time of the hydrogen flow rate injected into the combustion chamber of the turbine engine at the output of the hydrogen reservoir 4 and the hydrogen pressure upstream of the metering member 5 of the hydrogen supply system A of the turbine engine, in the case of a fixed flow rate at the input of the hydrogen reservoir 4 according to an embodiment of the present invention.

[0106] In particular, the hydrogen reservoir 4 makes it possible to separate the dynamic variations in the upstream portion of the hydrogen supply system A from the dynamic variations in the downstream portion of the hydrogen supply system A.

[0107] Figure 2 The top part shows an example of the hydrogen flow rate injected into the combustion chamber varying with time. Figure 2 The bottom part shows the hydrogen pressure P upstream of the metering member 5 上游 corresponding variation with time.

[0108] It is assumed that the hydrogen flow rate injected into the combustion chamber is constant.

[0109] In the first step, the injected hydrogen flow rate is equal to the first hydrogen flow rate value Q 1 , the first hydrogen flow rate value Q 1 is constant before the first time t 1 , and then, the first hydrogen flow rate value Q 1 increases to a second hydrogen flow rate value Q greater than the first hydrogen flow rate value Q 1 . 2

[0110] From the second time t after the first time t 1 , the hydrogen flow rate injected into the combustion chamber is constant and equal to the second hydrogen flow rate value Q 2 . 2

[0111] It is also assumed that the hydrogen pressure P upstream of the metering member 5 上游 is constant.

[0112] In the first step, the hydrogen pressure P 上游 is equal to the first hydrogen pressure value P before the first time t 1 , and then, the hydrogen pressure P 上游1 decreases to a second hydrogen pressure value P less than the first hydrogen pressure value P 上游 . 上游1 上游2

[0113] From the third time t after the first time t 1 and the second time t 2 , the hydrogen pressure P upstream of the metering member 5 3 is constant and equal to the second hydrogen pressure value P 上游 . 上游2

[0114] Therefore, as the hydrogen flow rate injected into the combustion chamber increases, the hydrogen pressure P upstream of the metering member 5 上游 decreases in a way with a certain inertial delay, and this inertial delay depends on the volume of the hydrogen storage tank 4. This inertial delay increases with the increase in the volume of the hydrogen storage tank 4.

[0115] Conversely, if the hydrogen flow rate injected into the combustion chamber decreases, the hydrogen pressure P upstream of the metering member 5 上游Increase in such a way that there is the same inertial delay.

[0116] Figure 2 The bottom part of shows the hydrogen pressure P upstream of the metering member 5 上游 Two curves showing the variation over time. In the case where the volume of the hydrogen reservoir 4 decreases, the solid line curve represents the variation over time of the hydrogen pressure P 上游 upstream of the metering member 5. In the case where the volume of the hydrogen reservoir 4 increases, the dashed line curve represents the variation over time of the hydrogen pressure P 上游 upstream of the metering member 5.

[0117] For example, the volume of the hydrogen reservoir 4 is selected such that the hydrogen pressure P 上游 upstream of the metering member has a slower dynamic variation than the dynamic of the hydrogen flow rate injected into the combustion chamber. In particular, the volume of the hydrogen reservoir 4 is selected such that the hydrogen pressure P 上游 has a dynamic variation 5 to 10 times slower than the dynamic of the hydrogen flow rate injected into the combustion chamber.

[0118] Therefore, the volume of the hydrogen reservoir 4 is selected such that the pressure variation is slower than the desired dynamic (i.e., response time) of the metering function of the hydrogen flow rate injected into the combustion chamber, in particular 5 to 10 times slower.

[0119] Thus, as will be described below, the respective control logics of the upstream part and the downstream part of the hydrogen supply system A of the turbomachine can be separated.

[0120] Figure 3 An embodiment of the regulating device B of the hydrogen supply system A of the turbomachine is schematically shown.

[0121] The regulating device B of the hydrogen supply system A includes a regulating loop that enables the separation of the respective control logics of the upstream part and the downstream part of the hydrogen supply system A of the turbomachine.

[0122] To this end, the first regulating loop is a closed loop including a pressure sensor 15 that can measure the hydrogen pressure in the hydrogen reservoir 4. Such a pressure sensor 15 can be the hydrogen pressure sensor 8, in particular, the hydrogen pressure sensor is arranged upstream of the metering member 5, in particular, between the hydrogen reservoir 4 and the metering member 5.

[0123] However, the pressure sensor 15 that can measure the hydrogen pressure in the hydrogen reservoir 4 must be as close as possible to the hydrogen reservoir 4.

[0124] The pressure sensor 15 is connected to the input of a subtractor 20 (in particular, the first subtractor 20). The subtractor 20 receives the value of the hydrogen pressure P accu in the hydrogen reservoir 4 measured by the pressure sensor 15 as an input value.

[0125] The subtracter 20 also receives the hydrogen pressure setpoint CP in the hydrogen reservoir 4 accu as an input value. The determination of the hydrogen pressure setpoint CP in the hydrogen reservoir 4 will be described below accu .

[0126] The subtracter 20 calculates the difference between the received hydrogen pressure value P accu and the hydrogen pressure setpoint CP accu . This difference represents the hydrogen pressure error εP in the hydrogen reservoir 4 accu .

[0127] The subtracter 20 is connected to the input of the first regulator 21 (such as a pressure regulator), and supplies the hydrogen pressure P in the hydrogen reservoir 4 accu and the difference between the hydrogen pressure setpoint CP accu , that is, the hydrogen pressure error εP in the hydrogen reservoir 4 accu .

[0128] The first regulator 21 controls the pressurizing member 2 according to the hydrogen pressure error εP in the hydrogen reservoir 4 accu .

[0129] The first controller 21 is, for example, a PID ("Proportional, Integral, Derivative") type corrector, which is designed to be configured to minimize the pressure error εP accu , advantageously to zero, via the control of the pressurizing member 2

[0130] In this configuration, the first regulator 21 is slave to the hydrogen pressure P in the hydrogen reservoir 4 accu .

[0131] The second regulation loop is a closed loop including the hydrogen flow sensor 9

[0132] The hydrogen flow sensor 9 is connected to the input of the subtracter 30 (especially the second subtracter 30). The subtracter 30 receives the value of the hydrogen flow supplied to the injector measured by the hydrogen flow sensor 9 as an input value

[0133] The subtracter 30 also receives the hydrogen flow setpoint CQ to be injected into the combustion chamber as an input value. The hydrogen flow setpoint CQ is provided by the engine control device 40

[0134] The subtracter 30 calculates the difference between the received value of the hydrogen flow supplied to the injector 100 and the hydrogen flow setpoint CQ. This difference represents the hydrogen flow error εQ injected into the combustion chamber

[0135] The subtracter 30 is connected to the input of a second regulator 31, such as a flow regulator, and supplies to the second regulator 31 the difference between the hydrogen flow rate injected into the combustion chamber and the hydrogen flow rate setpoint CQ in the combustion chamber, i.e., the hydrogen flow rate error εQ injected into the combustion chamber.

[0136] The second regulator 31 controls the operation of the metering member 5 based on the hydrogen flow rate error εQ injected into the combustion chamber.

[0137] The second regulator 31 is, for example, a PID-type corrector that is designed to be configured to minimize, advantageously to zero, the flow rate error εQ via the control of the metering member 5.

[0138] In the case of acoustic metering, the benefit of the second regulator 31 is determined based on the pressure and temperature measurements provided by the hydrogen temperature sensor 7 and the hydrogen pressure sensor 8 in the hydrogen reservoir 4.

[0139] In the case of subsonic metering, the hydrogen pressure downstream of the metering member 5 is measured by a pressure measurement sensor, in particular the hydrogen pressure sensor 8, and the hydrogen pressure downstream of the metering member 5 is taken into account when determining the benefit of the second regulator 31.

[0140] Alternatively, the temperature is not taken into account when determining the benefit of the second regulator 31.

[0141] Thus, the second regulator 31 controls the metering member 5 by following the hydrogen flow rate injected into the combustion chamber.

[0142] As disclosed above, the engine control device 40 of the turbomachine is connected to the subtracter 30 and supplies to the subtracter 30 the hydrogen flow rate setpoint CQ to be injected into the combustion chamber.

[0143] The engine control device 40 of the turbomachine is also connected to a pressure setpoint processing circuit 50 and supplies to the pressure setpoint processing circuit 50 engine data, and the pressure setpoint processing circuit is capable of determining the hydrogen pressure CP in the hydrogen reservoir 4 accu 。

[0144] Figure 4 An embodiment of the pressure setpoint processing circuit 50 of the hydrogen pressure CP in the hydrogen reservoir 4 of the hydrogen supply system A according to the present invention is shown. accu of the pressure setpoint processing circuit 50.

[0145] More specifically, as disclosed above, the pressure setpoint processing circuit 50 of the hydrogen pressure setpoint CP accu in the hydrogen reservoir 4 is integrated into the regulating device B of the hydrogen supply system A of the turbomachine.

[0146] The pressure setpoint processing circuit 50 includes an input connected to the engine control device 40 of the turbine engine and an output connected to a first subtractor 20 that calculates the hydrogen pressure value P accu and the hydrogen pressure setpoint CP accu for the difference between.

[0147] The pressure setpoint processing circuit 50 includes a downstream pressure processing module 51 that can determine the hydrogen pressure P downstream of the metering member 5 下游 , as will be described below.

[0148] To this end, the downstream pressure processing module 51 receives the hydrogen flow value Q injected into the combustion chamber transmitted from the engine control device 40 and the hydrogen pressure value PS3 in the combustion chamber of the engine.

[0149] Taking into account the worst-case specification of the head loss ΔP of the injector 100 喷射器 , the downstream hydrogen pressure P 下游 is equal to the hydrogen pressure value PS3 added to the head loss ΔP of the injector 100 喷射器 .

[0150] Therefore, the hydrogen pressure P 下游 is determined from the hydrogen pressure PS3 in the combustion chamber by the relationship (2):

[0151] P 下游 = PS3 + ΔP 喷射器 = PS3 + f(W) (2)

[0152] It should be noted that in the case where other equipment items (such as the cut-off member 6) of the hydrogen supply system A are located between the metering member 5 and the injector 100, the worst-case specification of the head loss of these equipment items can also be considered when determining the hydrogen pressure P 下游 .

[0153] Alternatively, the measurement of the hydrogen flow Q through the metering member 5 can be replaced by a flow setpoint processed by the engine control device 40.

[0154] The downstream pressure processing module 51 has an output connected to the input of a stable setpoint processing module 52 that can determine the stable hydrogen pressure setpoint CP in the hydrogen storage 4 accustab .

[0155] To this end, as described in detail above, the downstream pressure processing module 51 provides the downstream hydrogen pressure value P 下游 to the stable setpoint processing module 52.

[0156] To ensure sonic metering, in the steady state, the hydrogen pressure P in the hydrogen storage 4 accuCorresponding to the hydrogen pressure P upstream of the metering member 5 上游 . Advantageously, the hydrogen pressure P in the hydrogen reservoir 4 accu is at least twice greater than the hydrogen pressure P downstream of the metering member 5 下游 .

[0157] In the case of this acoustic metering, in the steady state, the steady hydrogen pressure setpoint CP in the hydrogen reservoir 4 accustab must comply with the relation (3):

[0158] CP accustab ≥ 2×P 下游 , or

[0159] CP accustab ≥ 2×(PS3 + f(Q)) (3)

[0160] In the case of subsonic metering, in the steady state, the steady hydrogen pressure setpoint CP in the hydrogen reservoir 4 accustab must comply with the relation (3bis):

[0161] CP accustab ≥ P 下游 , or

[0162] CP accustab ≥ PS3 + f(Q) (3bis)

[0163] Subsonic metering enables:

[0164] - reducing the demand for the pressure gradient required for the pressurizing member 2 by the first regulator 21 to follow the steady hydrogen pressure setpoint CP in transient states accustab ; and

[0165] - reducing the pressure demand in the steady state, thus optimizing the sizing of the equipment of the pressurizing member 2. Therefore, the pressure constraint on the sizing of the equipment between the pressurizing member 2 and the metering member 5 can be reduced.

[0166] Alternatively, the metering performed by the metering member 5 is acoustic or subsonic, depending on the state of the engine and / or the turbomachine.

[0167] For example, at low engine and / or turbomachine speeds corresponding to a low hydrogen flow rate Q, the metering is acoustic. Conversely, at high engine and / or turbomachine speeds corresponding to a high hydrogen flow rate Q, the metering is subsonic.

[0168] Manage the switching from the acoustic metering mode to the subsonic metering mode and from the subsonic metering mode to the acoustic metering mode via the regulated hydrogen pressure setpoint CP accu to obtain the hydrogen pressure P downstream of the metering member 5下游 The ratio with the hydrogen pressure P upstream of the metering member 5 such that 上游 between, such that

[0169] - In acoustic metering:

[0170] and

[0171] - In subsonic metering:

[0172]

[0173] This variant enables:

[0174] - To reduce the need for the pressure gradient required for the pressurizing member 2 by the first regulator 21 to follow the stable hydrogen pressure setpoint CP in transient conditions accustab ;

[0175] - To reduce the pressure demand in steady state, thereby optimizing the sizing of the equipment of the pressurizing member 2. Thus, the pressure constraint on the sizing of the equipment between the pressurizing member 2 and the metering member 5 can be reduced; and

[0176] - To have better flow reconstruction accuracy for low hydrogen flow rates Q during injection, especially during the start-up phase, when calculating the hydrogen flow rate Q at the injector 100.

[0177] The downstream pressure processing module 52 has an output connected to the input of the phase advance determination module 53, which can define the compensation for the response time of the first regulator 21 in transient conditions. The downstream pressure processing module 52 provides the stable hydrogen pressure setpoint CP in the hydrogen storage 4 accustab to the phase advance determination module 53.

[0178] In fact, the first regulator 21 has a response time τ21. Therefore, in order to comply with relation (3) in transient conditions, despite the first regulator 21 having a response time τ21, it is necessary to compensate for the response time of the first regulator 21 in transient conditions. Thus, the phase advance is determined by the following function:

[0179] H(P) = 1 + τ21.P

[0180] Figure 5 Shows a graph representing the variation over time of the hydrogen pressure setpoint CP in the hydrogen storage 4 of the hydrogen supply system A, especially during a change of state accu over time.

[0181] A change of state is characterized in that the hydrogen pressure setpoint CP in the hydrogen storage 4 accu goes from a first value P corresponding to a first stable state 1Change to a second value P corresponding to the second stable state 2 , in the example described, the second value P 2 is greater than the first value P 1 .

[0182] From a first value P of the hydrogen pressure setpoint CP accu to a second value P 1 The switching occurs between a first time t 2 and a second time t 10 The first time t 20 and the second time t 10 define a transient period between a first stable state ending at the first time t 20 and a second stable state starting at the second time t 10 . 20 The transient period between the first stable state ending at the first time t

[0183] During the transient period, that is, between the first time t 10 and the second time t 20 the hydrogen pressure setpoint CP in the hydrogen reservoir 4 accu increases from a first value P 1 to a maximum value P greater than the second value P 2 and then decreases to the second value P 最大 . 2 .

Claims

1. An adjustment device (B) for adjusting a hydrogen supply system (A) of a turbine engine including a combustion chamber, the hydrogen supply system at least including, in particular, arranged in series: - a pressurizing member (2), and - a metering member (5), advantageously, the metering member being connected to the combustion chamber, characterized in that the adjustment device further includes: - a hydrogen storage (4) arranged between the pressurizing member (2) and the metering member (5), - A first regulator (21), which is capable of controlling the pressurizing member (2) according to the hydrogen pressure (P accu ) in the hydrogen storage (4) and the hydrogen pressure setpoint (CP accu ) in the hydrogen storage (4), and - a second regulator (31) capable of controlling the metering member (5) according to the hydrogen flow rate (Q) injected into the combustion chamber and the hydrogen flow rate setpoint (CQ) to be injected into the combustion chamber.

2. The adjustment device (B) according to claim 1, wherein The first regulator (21) controls the operation of the pressurizing member (2) based on the difference between the hydrogen pressure (P accu ) in the hydrogen reservoir (4) and the hydrogen pressure setpoint (CP accu ) in the hydrogen reservoir (4).

3. The adjustment device (B) according to claim 1 or 2, wherein the second regulator (31) controls the operation of the metering member (5) according to the difference between the hydrogen flow rate (Q) injected into the combustion chamber and the hydrogen flow rate setpoint (CQ) to be injected into the combustion chamber.

4. The adjustment device (B) according to any one of the preceding claims, characterized in that The regulating device further includes a pressure setpoint processing circuit (50), and the pressure setpoint processing circuit is capable of determining the hydrogen pressure setpoint (CP accu ).

5. The adjustment device (B) according to claim 4, wherein The pressure setpoint processing circuit (50) includes an input connected to the engine control device (40) of the turbomachine and an output connected to a first subtractor (20) for calculating the difference between the hydrogen pressure value (P accu ) and the hydrogen pressure setpoint (CP accu ).

6. The adjustment device (B) according to claim 4 or 5, wherein The pressure setpoint processing circuit (50) includes a downstream pressure processing module (51) that is capable of determining the hydrogen pressure (P 下游 ) downstream of the metering member (5).

7. The adjustment device (B) according to claim 6, wherein The downstream pressure processing module (51) determines the hydrogen pressure (P 下游 ) downstream of the metering member (5) based on the hydrogen flow rate value (Q) injected into the combustion chamber and the hydrogen pressure value (PS3) in the combustion chamber.

8. The adjustment device (B) according to claim 6 or 7, wherein The pressure setpoint processing circuit (50) includes a steady-state setpoint processing module (52) that is capable of determining a steady-state hydrogen pressure setpoint (CP accustab ) in the hydrogen reservoir (4).

9. The adjustment device (B) according to any one of claims 6 to 8, wherein the pressure setpoint processing circuit (50) includes a phase lead determination module (53) capable of defining the compensation of the response time of the first regulator (21) in transient conditions.

10. The adjustment device (B) according to any one of the preceding claims, wherein The metering member (5) performs sonic and / or subsonic metering as a function of the hydrogen pressure setpoint (CP accu ).

11. A hydrogen supply system of a turbine engine, characterized in that the hydrogen supply system of the turbine engine includes the adjustment device according to any one of claims 1 to 10.

12. A turbine engine including an injector, characterized in that the turbine engine includes the hydrogen supply system according to claim 11.

13. An aircraft including the turbine engine according to claim 12.

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